《宋书·列传·卷七十三》
后将军，吴国内史刘柳推举延之做他的内参军。后来延之升迁主簿。
穆之既与延之通家，又闻其美，将仕之；先欲相见，延之不往也。
Later General, Liu Liu of Wu, recommended Yan Yan as his internal staff. Later, Yan Zhi was promoted to the post of the chief clerk.