《隋书·列传·卷四十四》
杨约的兄长杨素，当时是尚书令，见萧琮把堂妹嫁给钳耳氏，于是对萧琮说： 你是帝王之族，族望名美，为什么嫁堂妹给钳耳氏？ 
约兄素，时为尚书令，见琮嫁从父妹于钳耳氏，因谓琮曰： 公，帝王之族，望高戚美，何乃适妹钳耳氏乎？ 
Yang Yue's eldest brother, Yang Su, was the Minister of Personnel at that time. When he saw that Xiao Cong had married his cousin to someone of the Qianer clan, he said to Xiao Cong: "You are of the imperial lineage, with a prestigious reputation, why are you marrying your cousin to someone of the Qianer clan?"