This is a collection of 4 encyclopaedia volumes (Imperial Readings of the Taiping Era; Extensive Records of the Taiping Era; Finest Blossoms in the Garden of Literature; Prime Tortoise of the Record Bureau), whose compilation finished in the 11th century. The best known is the Extensive Records of the Taiping Era, compiled under the editorship of Li Fang from over three hundred books and novels from the Han Dynasty to the early Song Dynasty.
Editors. "Chinese Four Great Books of Song begun". The Literary Encyclopedia. First published 01 May 2009
[https://www.litencyc.com/php/stopics.php?rec=true&UID=7079, accessed 21 February 2019.]