Zhengdian (book) explained

The Zhengdian was a 35-volume Chinese political treatise in historical form which was written approximately in 742 by Liu Zhi, son of esteemed historical critic Liu Zhiji.^[1] The book did not survive, but it was further expanded and borrowed by Du You in his Tongdian.

References

• Yang, Xumin. Lun Liu Zhi (On Liu Zhi). Huaihai Wenhui. 2002.2. p. 32-36.
• Robert G. Hoyland (1998). Seeing Islam as others saw it : a survey and evaluation of Christian, Jewish, and Zoroastrian writings on early Islam. Princeton, N.J: Darwin Press. .

Notes and References

1. Robert Hoyland, Seeing Islam as Others Saw It p. 244 from Twitchett, Official History under the T'ang 104-107