《晋书·志·第四章》
从孔甲之后而到桀当政期间，诸侯互相兼并，能够保存下来的有三千多邦国，与夏后氏在涂山大会诸侯时相比，损失了约十分之七。
自孔甲之后，以至于桀，诸侯相兼，其能存者三千余国，方于涂山，十损其七矣。
From Kong Jia to the reign of Jie, the princes annexed each other, and more than three thousand states were preserved, which was about one-seventh less than when the Xia Hou clan held a meeting of the princes in Tushen.