《北史·列传·卷三十八》
他因五舅父沮渠蒙逊曾据守凉州一带，而国书上却没有记载，便撰写了《凉书》十卷，刊行于世。
谦之以父舅氏沮渠蒙逊曾据凉土，国书漏阙，乃修《凉书》十卷，行于世。
Because his fifth paternal uncle, Juqu Mengxun, had occupied Liangzhou without being recorded in the national history, he wrote the ten-volume "Liang Shu" and published it for the world.