《隋书·列传·卷十三》
开皇十八年，突厥达头可汗进犯边塞。高祖拜杨素为灵州道行军总管，出塞讨伐，并赐给他织物两千段、黄金一百斤。
十八年，突厥达头可汗犯塞，以素为灵州道行军总管，出塞讨之，赐物二千段，黄金百斤。
In the 18th year of the Kaihuang reign, Tujue Datu Khan invaded the border. Gaozu made Yang Su the General Manager of the Lingzhou Dao Army, sent him outside the border to carry out a punitive expedition, and rewarded him with two thousand bolts of cloth and one hundred catties of gold.