  The Heshanggong version preserved in the Sibu congkan series is taken from the library of the famous bibliophile Qu Yong (fl. 1850). According to Qu’s own catalogue, this is a Song dynasty version, published probably after the reign of the emperor Xiaozong (r. 1163–1189). Older extant Heshanggong versions include two incomplete Tang versions and fragments found in Dunhuang.