《明史·列传·卷二百一十五》
卜失兔是扌奢力克的旁系孙子，因袭受封顺义王时，势力已稍有衰弱，他所统治的只有山、大二个镇外面十二个部落。
卜失兔为撦力克孙，袭封时，已少衰，所制止山、大二镇外十二部。
Boshitu was a collateral descendant of Babaosheli, and by the time he inherited the title of Shunyi King, his power had weakened somewhat; he only ruled over the twelve tribes outside the two towns of Shan and Da, and his military strength was comparable to that of the tribal leaders Wulutai, Sunang and Wushentaiji under his command.