《宋书·志·卷十一》
元帝时，郎中京房知道五音六十律所对应的数字，并从师于小黄县令焦延寿学习。
元帝时，郎中京房知五音六十律之数，受学于小黄令焦延寿。
During the reign of Emperor Yuan, Jing Fang, a Gentleman-of-the-Household, learned about the numbers corresponding to the five musical notes and sixty musical intervals, and he studied with Jiao Yanshou, the Magistrate of Xiao Huang.