《贞观政要·卷九·论征伐》
至于突厥颉利，几年来他多次进犯中原，部落成员被战事弄得疲惫不堪，终于也灭亡了。
至如颉利，往岁数来侵我国家，部落疲于征役，遂至灭亡。
As for the Turkic Jieli, he invaded the Central Plains many times over the years, the members of his tribe were exhausted by the war, and he was finally destroyed.