송서
The Book of Song was based on records compiled beginning in the Liu Song. He Chentian 何承天 (370-447) was commissioned by the imperial court of the time in 439. He compiled biographies and also treatises on astronomy and music. Compilation was later continued by Shan Qianzhi 山謙之 (fl. 440-456), and Xu Yuan 徐爰 (394-475). The Qi court commissioned Shen Yue in 487 to complete the Book of Song.