Four tones (Middle Chinese) explained

The four tone classes of Chinese
 ꜂上 shǎng  去꜄ 
 ꜀平  píng 入꜆  ru(ʔ) 
The four tones of Chinese poetry and dialectology are four traditional tone classes[1] of Chinese words. They play an important role in Chinese poetry and in comparative studies of tonal development in the modern varieties of Chinese, both in traditional Chinese and in Western linguistics. They correspond to the phonology of Middle Chinese, and are named even or level (Chinese: píng), rising (Chinese: shǎng), departing or going (Chinese: ), and entering or checked (Chinese: ).[2] (The last three are collectively referred to as oblique Chinese: (), an important concept in poetic tone patterns.) They are reconstructed as mid (˧ or 33), mid rising (˧˥ or 35), high falling (˥˩ or 51), and mid (˧ or 33) with a final stop consonant respectively.[3] Due to historic splits and mergers, none of the modern varieties of Chinese have the exact four tones of Middle Chinese, but they are noted in rhyming dictionaries.

Background

According to the usual modern analysis, Early Middle Chinese had three phonemic tones in most syllables, but no tonal distinctions in checked syllables ending in the stop consonants /p/, /t/, /k/. In most circumstances, every syllable had its own tone; hence a multisyllabic word typically had a tone assigned to each syllable. (In modern varieties, the situation is sometimes more complicated. Although each syllable typically still has its own underlying tone in most dialects, some syllables in the speech of some varieties may have their tone modified into other tones or neutralized entirely, by a process known as tone sandhi. Furthermore, many varieties of Chinese deleted Middle Chinese final consonants, but these contrasts may have been preserved, helping lead to tonogenesis of contemporary multitonal systems.)

Traditional Chinese dialectology reckons syllables ending in a stop consonant as possessing a fourth tone, known technically as a checked tone. This tone is known in traditional Chinese linguistics as the entering (Chinese: ) tone, a term commonly used in English as well. The other three tones were termed the level (or even) tone (Chinese: píng), the rising (Chinese: shǎng) tone, and the departing (or going) tone (Chinese: ).[2] The practice of setting up the entering tone as a separate class reflects the fact that the actual pitch contour of checked syllables was quite distinct from the pitch contour of any of the sonorant-final syllables. Indeed, implicit in the organisation of the classical rime tables is a different, but structurally equally valid, phonemic analysis, which takes all four tones as phonemic and demotes the difference between stop finals pronounced as /[p t k]/ and nasal finals pronounced as /[m n ŋ]/ to allophonic, with stops occurring in entering syllables and nasals elsewhere.[4]

From the perspective of modern historical linguistics, there is often value in treating the entering tone as a tone regardless of its phonemic status, because syllables possessing this tone typically develop differently from syllables possessing any of the other three tones. For clarity, these four tones are often referred to as tone classes, with each word belonging to one of the four tone classes. This reflects the fact that the lexical division of words into tone classes is based on tone, but not all tone classes necessarily have a distinct phonemic tone associated with them. Some contemporary fāngyán such as Taiwanese Hokkien, Jin and Penang are said to preserve the entering tone, which is used as a marker to differentiate them from other varieties and also genetically classify them via the comparative method.

The four Early Middle Chinese (EMC) tones are nearly always presented in the order level (Chinese: píng), rising (Chinese: shǎng), departing (Chinese: ), entering (Chinese: ), and correspondingly numbered 1 2 3 4 in modern discussions. In Late Middle Chinese (LMC), each of the EMC tone classes split in two, depending on the nature of the initial consonant of the syllable in question. Discussions of LMC and the various modern varieties will often number these split tone classes from 1 through 8, keeping the same ordering as before. For example, LMC/modern tone classes 1 and 2 derive from EMC tone class 1; LMC/modern tone classes 3 and 4 derive from EMC tone class 2; etc. The odd-numbered tone classes 1 3 5 7 are termed dark (Chinese: yīn), whereas the even-numbered tone classes 2 4 6 8 are termed light (Chinese: yáng). Hence, for example, LMC/modern tone class 5 is known in Chinese as the yīn qù (dark departing) tone, indicating that it is the yīn variant of the EMC tone (EMC tone 3). In order to clarify the relationship between the EMC and LMC tone classes, some authors notate the LMC tone classes as 1a 1b 2a 2b 3a 3b 4a 4b in place of 1 2 3 4 5 6 7 8, where a and b correspond directly to Chinese yīn and yáng, respectively.

Baxter's transcription, an alphabetic notation for representing Middle Chinese, represents the rising (Chinese: shǎng) tone with a trailing X, the departing (Chinese: ) tone with a trailing H, and it leaves the level and entering tones unmarked.

Names

In Middle Chinese, each of the tone names carries the tone it identifies: Chinese: level ꜁pronounced as /biajŋ/, Chinese: rising ꜃pronounced as /dʑɨaŋ/, Chinese: departing pronounced as /kʰɨə/꜄, and Chinese: entering pronounced as /ȵip/꜇.[5] However, in some modern Chinese varieties, this is no longer true. This loss of correspondence is most notable in the case of the entering tone, syllables checked in a stop consonant pronounced as /[p̚]/, pronounced as /[t̚]/, or pronounced as /[k̚]/ in Middle Chinese, which has been lost from most dialects of Mandarin and redistributed among the other tones.

In modern Chinese varieties, tones that derive from the four Middle Chinese tone classes may be split into two registers, dark (Chinese: yīn) and light (Chinese: yáng) depending on whether the Middle Chinese onset was voiceless or voiced, respectively. When all four tone classes split, eight tones result: dark level (Chinese: 陰平), light level (Chinese: 陽平), dark rising (Chinese: 陰上), light rising (Chinese: 陽上), dark departing (Chinese: 陰去), light departing (Chinese: 陽去), dark entering (Chinese: 陰入), and light entering (Chinese: 陽入). Sometimes these have been termed upper and lower registers respectively, but that may be a misnomer, as in some dialects the dark registers may have the lower tone, and the light register the higher tone.

Chinese dictionaries mark the tones with diacritical marks at the four corners of a character:[6] Chinese: ꜀平 level, Chinese: ꜂上 rising, Chinese: 去꜄ departing, and Chinese: 入꜆ entering. When yin and yang tones are distinguished, these are the diacritics for the yin (dark) tones; the yang (light) tones are indicated by underscoring the diacritic: Chinese: ꜁平 light level, Chinese: ꜃上 light rising, Chinese: 去꜅ light departing, Chinese: 入꜇ light entering. These diacritics are also sometimes used when the phonetic realization is unknown, as in the reconstructions of Middle Chinese at the beginning of this section. However, in this article, the circled numbers ①②③④⑤⑥⑦⑧ will be used, as in the table below, with the odd numbers ①③⑤⑦ indicating either 'dark' tones or tones that have not split, and even numbers ②④⑥⑧ indicating 'light' tones. Thus, level tones are numbered ①②, the rising tones ③④, the departing tones ⑤⑥, and the entering (checked) tones ⑦⑧.

In Yue (incl. Cantonese) the dark entering tone further splits into high (Chinese: 高陰入) and low (Chinese: 低陰入) registers, depending on the length of the nucleus, for a total of nine tone classes. Some dialects have a complex tone splittings, and the terms dark and light are insufficient to cover the possibilities.

The number of tone classes is based on Chinese tradition, and is as much register as it is actual tone. The entering 'tones', for example, are distinct only because they are checked by a final stop consonant, not because they have a tone contour that contrasts with non-entering tones. In dialects such as Shanghainese, tone classes are numbered even if they are not phonemically distinct.

Origin

The tonal aspect of Chinese dialects that is so important today is believed by some linguists to have been absent from Old Chinese, but rather came about in Early Middle Chinese after the loss of various finals. According to Sagart (1999:11),[7]

The four tones of Middle Chinese, Chinese: píng level, Chinese: shǎng rising, Chinese: departing, and Chinese: entering, all evolved from different final losses from Old Chinese. The Chinese: , or rising tone, arose from the loss of glottal stops at the end of words. Support for this can be seen in Buddhist transcriptions of the Han period, where the rising tone was often used to note Sanskrit short vowels, and also in loans of words with final pronounced as /[q]/ in the source language, which were borrowed into Chinese as shǎng tone. The glottal stop even survives in some Min and Hakka dialects, either as a phonetic glottal stop, a short creaky vowel, or denasalization, which for example the final -ng of Old Chinese has changed to modern pronounced as /[ɡ]/ in shang-tone words.[8] This evolution of final glottal stop into a rising tone is similar to what happened in Vietnamese, another tonal language.[9] The Chinese: , or departing tone, arose from the loss of [-s] at the end of words. Support for this theory is found when examining Chinese loans into neighbouring East Asian languages. For example, in Korean, the word for comb, pis, is a loan of the Chinese word Chinese: , which means that when the word comb was borrowed into Korean, there was still an [-s] sound at the end of the word that later disappeared from Chinese and gave rise to a departing Chinese: tone. The Chinese: , or entering tone consisted of words ending in voiceless stops, [-p], [-t], and [-k]. Finally, the Chinese: , or level tone, arose from the lack of sound at the ends of words, where there was neither [-s], a glottal stop, nor [-p], [-t], or [-k].[7]

Distribution in modern Chinese and Sino-Vietnamese

Sample dialects and their realization of tone are given below.

Different authors typically have different opinions as to the shapes of Chinese tones. Tones typically have a slight purely phonetic drop at the end in citation form. It is therefore likely that a tone with a drop of one unit (54, say, or 21) is not distinct from a level tone (a 55 or 22); on the other hand, what one author hears as a significant drop (53 or 31) may be perceived by another as a smaller drop so it is often ambiguous whether a transcription like 54 or 21 is a level or contour tone. Similarly, a slight drop before a rise, such as a 214, may be from the speaker approaching the target tone and so may also not be distinctive (from 14).[10]

Distribution of the four tone classes in modern Chinese
Each tone class is numbered Chinese: to Chinese: , depending on its reflex of Late Middle Chinese, followed by its actual pronunciation, using a tone letter to illustrate its contour and then a numerical equivalent.
major groupsubgrouplocal varietyEarly Middle Chinese tone classnumber of
tone classes
(number of
phonemic tones)
Chinese: ꜀'''平''' Level Chinese: ꜀①꜁②Chinese: ꜂'''上''' Rising Chinese: ꜂③꜃④Chinese: '''去'''꜄ Departing Chinese: ⑤꜄⑥꜅Chinese: '''入'''꜆ Entering Chinese: ⑦꜆⑧꜇
Syllable onset
voicelessvoicedvoicelessvoicedvoicelessvoicedvoicelessvoiced
sonobssonobstenuisaspsonobs(short)(long)sonobs
Sample characters:Chinese: 加坡Chinese: Chinese: Chinese: 岛考Chinese: Chinese: Chinese: Chinese: Chinese: Chinese: Chinese: 北七Chinese: Chinese: Chinese:
MandarinBeijingBeijing① pronounced as /˥/ 55② pronounced as /˧˥/ 35③ pronounced as /˨˩˦/ 21(4)⑤ pronounced as /˥˩/ 51(any)4
Taipei[11] ① pronounced as /˦/ 44② pronounced as /˧˨˧/ 323③ pronounced as /˧˩˨/ 31(2)⑤ pronounced as /˥˨/ 52(any)4
NortheasternHarbin① pronounced as /˦/ 44② pronounced as /˨˧/ 23③ pronounced as /˨˩˧/ 213⑤ pronounced as /˥˧/ 53(any)4
Shenyang① pronounced as /˧/ 33② pronounced as /˧˥/ 35③ pronounced as /˨˩˧/ 213⑤ pronounced as /˥˧/ 53(any)4
Jiao - LiaoDalian① pronounced as /˦˨/ 42 ① or ②② pronounced as /˧˥/ 35 ③ pronounced as /˨˩˧/ 213⑤ pronounced as /˥˧/ 53 4
Ji - LuTianjin① pronounced as /˨˩/ 21② pronounced as /˧˥/ 35③ pronounced as /˩˩˧/ 113⑤ pronounced as /˥˧/ 534
Jinan① pronounced as /˨˩˧/ 213② pronounced as /˦˨/ 42③ pronounced as /˥/ 55⑤ pronounced as /˨˩/ 214
Zhongyuan
(Central Plain)
Xi'an① pronounced as /˧˩/ 31② pronounced as /˨˦/ 24③ pronounced as /˦˨/ 42⑤ pronounced as /˥/ 554
Dungan① pronounced as /˨˦/ 24③ pronounced as /˥˩/ 51⑤ pronounced as /˦/ 443
Lan - Yin
Lanzhou① pronounced as /˧˩/ 31② pronounced as /˥˧/ 53③ pronounced as /˦˦˨/ 442⑤ pronounced as /˩˧/ 134
Yinchuan3
SouthwesternWuhan① pronounced as /˥/ 5② ˨˩˧ 213③ pronounced as /˦˨/ 42⑤ pronounced as /˧˥/ 354
Chengdu① pronounced as /˥/ 5② pronounced as /˨˩/ 21③ pronounced as /˦˨/ 42⑤ pronounced as /˨˩˧/ 2134
-->Luzhou① pronounced as /˥/ 5② pronounced as /˨˩/ 21③ pronounced as /˦˨/ 42⑤ pronounced as /˩˧/ 13⑦ pronounced as /˧/ 35
Kunming① pronounced as /˦/ 4② pronounced as /˧˩/ 31③ ˥˧ 53⑤ pronounced as /˨˩˨ / 2124
Jiang - HuaiNanjing① pronounced as /˧˩/ 31② pronounced as /˩˧/ 13③ pronounced as /˨˩˨/ 212⑤ pronounced as /˦/ 44⑦ pronounced as /˥/ 55 (4)
Nantong① 35 ② 21 ③ 55 ⑤ 213 ⑥ 42 ⑦ 55ʔ ⑧ 42ʔ 7 (5)
JinBingzhouTaiyuan① pronounced as /˩/ 11③ pronounced as /˥˧/ 53⑤ pronounced as /˦˥/ 45⑦ pronounced as /˨/ 2⑧ pronounced as /˥˦/ 545 (3)
WuTaihuShanghainese① pronounced as /˥˨/ 52⑤ pronounced as /˧˧˦/ 334⑥ pronounced as /˩˩˧/ 113⑦ pronounced as /˥/ 5⑧ pronounced as /˨˧/ 235 (2)
Suzhou① pronounced as /˦/ 44② pronounced as /˨˦/ 24③ pronounced as /˥˨/ 52⑤ pronounced as /˦˩˨/ 412⑥ pronounced as /˧˩/ 31⑦ pronounced as /˦/ 4⑧ pronounced as /˨˧/ 237 (3)
Yixing[12] ① pronounced as /˥/ 55② pronounced as /˩˥/ 15③ pronounced as /˥˩/ 51④ pronounced as /˧˥/ 35④/⑥⑤ pronounced as /˥˩˧/ 513⑥ pronounced as /˨˩/ 21⑦ pronounced as /˥/ 5/⑧⑧ pronounced as /˩˧/ 138 (3)
OujiangWenzhounese① pronounced as /˦/ 44 ② pronounced as /˧˩/ 31 ③ʔ/④ʔ pronounced as /˧˥/ 35 ⑤ pronounced as /˥˨/ 52 ⑥ pronounced as /˨/ 22 ⑦/⑧ ˧˨˧ 323 8 (4–6)
HuizhouJi-SheJixi① pronounced as /˧˩/ 31② pronounced as /˦/ 44③ pronounced as /˨˩˧/ 213⑤ pronounced as /˧˥/ 35⑥ pronounced as /˨/ 22⑦ pronounced as /˧˨/ 326 (5)
XiangNewChangsha① pronounced as /˧/ 33② pronounced as /˩˧/ 13③ pronounced as /˦˩/ 41⑤ pronounced as /˥/ 55⑥ pronounced as /˨˩/ 21⑦ pronounced as /˨˦/ 246 (5)
GanChangjingNanchang① pronounced as /˦˨/ 42② pronounced as /˨˦/ 24③ pronounced as /˨˩˧/ 213⑤ pronounced as /˥/ 55⑥ pronounced as /˨˩/ 21⑦ pronounced as /˥/ 5⑧ pronounced as /˨˩/ 217 (5)
HakkaMeizhouMeixian① pronounced as /˦/ 44② pronounced as /˩/ 11③ pronounced as /˧˩/ 31⑤ pronounced as /˥˨/ 52⑦ pronounced as /˨˩/ 21⑧ pronounced as /˦/ 46 (4)
YueYuehaiGuangzhou,
Hong Kong
①a pronounced as /˥/ 55 ~ ② pronounced as /˨˩/ 21~11③ pronounced as /˨˥/ 25④ pronounced as /˨˧/ 23 ④/⑥⑤ pronounced as /˧/ 33⑥ pronounced as /˨/ 22⑦a pronounced as /˥/ 5⑦b pronounced as /˧/ 3⑧ pronounced as /˨/ 29~10 (6~7)
Shiqi① pronounced as /˥/ 55② ˥˩ 51③ ˩˧ 13⑤ ˨ 22⑦a pronounced as /˥/ 5⑧ ˨ 26 (4)
SiyiTaishanese① pronounced as /˧/ 33? pronounced as /˩/ 11③ pronounced as /˥/ 55? pronounced as /˨˩/ 21⑥ pronounced as /˧˨/ 32⑦a pronounced as /˥/ 5⑦b pronounced as /˧/ 3⑧ pronounced as /˨˩/ 218 (5)
Gou-LouBobai① pronounced as /˦/ 44? pronounced as /˨˧/ 23③ pronounced as /˧/ 33? pronounced as /˦˥/ 45⑤ pronounced as /˧˨/ 32⑥ pronounced as /˨˩/ 21⑦a pronounced as /˥˦/ 54⑦b pronounced as /˩/ 1⑧a pronounced as /˦/ 4
(long)
⑧b pronounced as /˧˨/ 32
(short)
10 (6)
PinghuaSouthernNanning① pronounced as /˥˨/ 52? pronounced as /˨˩/ 21③ pronounced as /˦/ 44? pronounced as /˨˦/ 24⑤ pronounced as /˥/ 55⑥ pronounced as /˨/ 22⑦ pronounced as /˦/ 4⑧a pronounced as /˨˦/ 24⑧b pronounced as /˨/ 29 (6)
MinNorthernJian'ou① pronounced as /˥˦/ 54③ pronounced as /˨˩/ 21⑤ pronounced as /˨/ 22⑥ pronounced as /˦/ 44⑦ pronounced as /˨˦/ 24⑧ pronounced as /˦˨/ 426 (4)
EasternFuzhou① pronounced as /˥/ 55② pronounced as /˥˧/ 53 ③ pronounced as /˧/ 33③/⑥⑤ pronounced as /˨˩˧/ 213⑥ pronounced as /˨˦˨/ 242⑦ pronounced as /˨˦/ 24⑧ pronounced as /˥/ 57 (5)
CentralYong'an① pronounced as /˦˨/ 42 ② pronounced as /˧/ 33 ③ pronounced as /˨˩/ 21 ④ pronounced as /˥˦/ 54 ⑤ pronounced as /˨˦/ 24 ⑦ pronounced as /˩˨/ 12 6
SouthernAmoy① pronounced as /˥/ 55② pronounced as /˧˥/ 35 ③ pronounced as /˥˧/ 53③/⑥⑤ pronounced as /˨˩/ 21⑥ pronounced as /˧/ 33⑦ pronounced as /˩/ 1⑧ pronounced as /˥/ 57 (5)
Quanzhou① pronounced as /˧/ 33② pronounced as /˨˦/ 24③ pronounced as /˥/ 55③/④ ④ pronounced as /˨/ 22⑤ pronounced as /˦˩/ 41⑥ pronounced as /˦˩/ 41⑦ pronounced as /˥/ 5⑧ pronounced as /˨˦/ 248 (6)
Teochew① pronounced as /˧/ 33② pronounced as /˥/ 55 ③ pronounced as /˥˨/ 52④ pronounced as /˧˥/ 35⑤ pronounced as /˨˩˧/ 213⑥ pronounced as /˩/ 11④/⑥⑦ pronounced as /˨/ 2⑧ pronounced as /˦/ 48 (6)
Sino-Vietnamese[13] [14] NorthernHanoi[15] ① pronounced as /˦/ 44② pronounced as /˧˨/ 32③ pronounced as /˧˩˨/ 312④ pronounced as /˧˨˥/ 325④/⑥⑤ pronounced as /˧˦/ 34⑥ pronounced as /˨/ 22⑦ pronounced as /˦˥/ 45⑧ pronounced as /˨˩/ 218 (6)
CentralHue[16] ① pronounced as /˥˦/pronounced as /˥/ 545② pronounced as /˦˩/ 41③ pronounced as /˧˨/ 32③/⑥⑤ pronounced as /˨˩˦/ 214⑥ pronounced as /˧˩/ 31⑦ pronounced as /˦˧˥/ 435⑧ pronounced as /˧˩/ 317 (5)
SouthernSaigon[17] ① pronounced as /˦/ 44② pronounced as /˧˩/ 31③ pronounced as /˨˩˦/ 214③/⑥⑤ pronounced as /˧˥/ 35⑥ pronounced as /˨˩˨ / 212⑦ pronounced as /˦˥/ 45⑧ pronounced as /˨˩/ 217 (5)
major groupsubgrouplocal varietyvoicelesssonobsvoicelesssonobstenuisaspsonobs(short)(long)sonobs number of
tone classes
(number of
phonemic tones)
voicedvoicedvoicelessvoicedvoicelessvoiced
Syllable onset
Chinese: ꜀'''平''' Level Chinese: ꜀①꜁②Chinese: ꜂'''上''' Rising Chinese: ꜂③꜃④Chinese: '''去'''꜄ Departing Chinese: ⑤꜄⑥꜅Chinese: '''入'''꜆ Entering Chinese: ⑦꜆⑧꜇
Early Middle Chinese tone class

See also

Further reading

Notes and References

  1. A "tone class" is a lexical division of words based on tone. The four tones may not directly correspond with phonemic tone. The three tones of open syllables in Middle Chinese contrast with undifferentiated tone in checked syllables, and words are classified according to these four possibilities.
  2. Book: A Handbook of Old Chinese Phonology . Baxter, William H. . 1992 . Mouton de Gruyter . Berlin, New York . 3-11-012324-X . 33.
  3. Book: Wang. William S.-Y.. The Oxford Handbook of Chinese Linguistics. Sun. Chaofen . 2015-02-26. Oxford University Press. 978-0-19-026684-4. 84. en. It is commonly accepted that the pingsheng is with a level contour, the shangsheng a high rising tone, the qusheng a falling tone, and the rusheng a checked tone. Thus their tonal values may be reconstructed as ˧33, ˧˥35, ˥˩51, and ˧3ʔ, respectively..
  4. The non-uniqueness of phonemic solutions of phonetic systems . Chao Yuen-Ren . 1934 . Bulletin of the Institute for History and Philology (Academia Sinica) . 4 . 363–397.
  5. [Edwin G. Pulleyblank|Pulleyblank]
  6. Book: Karlgren , Bernhard . Bernhard Karlgren. 1974. 1923. Analytic Dictionary of Chinese and Sino-Japanese. Introduction I. Transcription system of the dictionary, Tones. 1st. Dover Publications, Inc. New York. 7/8. 0-486-21887-2. The p'ing (even), ṣang (rising) and k'ü (falling) inflexions are marked by hooks in the usual Chinese style. The ẓu ṣəng is characterized by the abrupt cutting off of the voice and recognized by final -p, -t or -k; there is no need of adding a hook (tat,).. Library of Congress Card Number 74-75625.
  7. Web site: Sagart. Laurent. The origin of Chinese tones . Proceedings of the Symposium/Cross-Linguistic Studies of Tonal Phenomena/Tonogenesis, Typology and Related Topics. Institute for the Study of Languages and Cultures of Asia and Africa, Tokyo University of Foreign Studies . 1 December 2014.
  8. Branner, David (1999). Problems in Comparative Chinese Dialectology: The Classification of Miin and Hakka. De Gruyter Mouton
  9. Tsu-Lin. Mei . Mei Tsu-lin . Tones and Prosody in Middle Chinese and The Origin of The Rising Tone . 2718766. Harvard Journal of Asiatic Studies. 30. 1970. 86–110. 10.2307/2718766.
  10. Matthew Chen, 2000. Tone Sandhi: Patterns across Chinese Dialects. CUP.
  11. Multiple sources:
  12. Xuhui Hu and J. Joseph Perry, 2018. The syntax and phonology of non-compositional compounds in Yixing Chinese. Natural Language and Linguistic Theory 36:701-42.
  13. Book: Nguyễn Tài, Cẩn . Nguồn gốc và quá trình hình thành cách đọc Hán Việt [The origin and formation of Sino-Vietnamese pronunciation]. Đại học Quốc gia Hà Nội . 2000. Hà Nội . 305–314.
  14. Web site: Từ tứ thanh tiếng Hán đến tám thanh Hán–Việt [From the four Middle Chinese tones to the eight Sino-Vietnamese tones]]. Nguyễn Tài . Cẩn . Ngôn ngữ học và Tiếng Việt . 25 March 2007 . April 21, 2020.
  15. Kirby . James P. . 2011. Vietnamese (Hanoi Vietnamese). Journal of the International Phonetic Association . 41/3.
  16. Web site: Hệ thống thanh điệu Huế [Tone system in Hue dialect]]. Nguyễn. Văn Lợi. Nguyễn Văn Lợi. 2013. Phonetics lab (Faculty of Vietnamese Studies). April 21, 2020. December 10, 2021. https://web.archive.org/web/20211210025602/http://vns.edu.vn/v1/phoneticslab/index.php?option=com_content&view=article&id=193:h-thng-thanh-iu-hu-&catid=65:sach-bai-bao&Itemid=237&lang=vi.
  17. Book: Huỳnh Công, Tín . Tiếng Sài Gòn [The Saigon dialect]. Chính Trị Quốc Gia - Sự Thật . 2013 . Cần Thơ . 70–77.