 Bibliographies from the Tang and Song dynasties contain references to seven other works attributed to Li Jing, but no reference to "Questions and Replies".A major work (the ""Dong Tian"") completed in the eighth century AD quotes Li Jing extensively, but never once mentions "Questions and Replies".Because of the lack of earlier reference to "Questions and Replies", and because of references from some Northern Songs scholars claiming to have seen drafts of "Questions and Replies" by a contemporary military scholar named "Yuan Yi", many scholars believed that "Questions and Replies" was forged by Yuan Yi in the early Song dynasty.