《资治通鉴·晋纪·晋纪三十四》
后秦王姚兴派乞伏乾归回去镇守苑川，把他过去的老部下、军队，全部分配给他。
秦王兴使乞伏乾归还镇苑川，尽以其故部众配之。
King Yao Xing of the Later Qin sent Qifugu Qiangui back to garrison Yuanchuan and reassigned all his former subordinates and soldiers to him.