《北史·列传·卷七十一》
后来又追请齐州录事参军萧悫、赵州功曹参军颜之推一同入京任撰录，还依照齐朝旧例，称他们为馆客。
后复追齐州录事参军萧悫、赵州功曹参军颜之推同入撰录，犹依霸朝，谓之馆客。
He later sent for Xiao Que, the Recorder of Qi Prefecture, and Yan Zhitui, the Army Advisor of Zhao Prefecture, to come to the capital to be compilers and editors. He also called them guest scholars in accordance with the old regulations of the Qi dynasty.