Meanwhile, most of these quotations were so-called quotations within quotations from earlier encyclopedias such as "Hsiu-wen-tien yu-lan" (one of the sources in the preparation of "Imperial Readings of the Taiping Era") (issho (lost book)) from the Northern Qi Dynasty and "Geimon-ruiju" (a Chinese encyclopedia, literally "Collection of Literature Arranged by Categories") and "Wensi Boyao" from the Tang Dynasty.
但し、原典からの引用ではなく、先行する類書である北斉の『修文殿御覧』（佚書）や、唐代の『芸文類聚』、『文思博要』（佚書）からのいわゆる孫引きであることが多い。