《北史·列传·卷三十三》
真度在回信中盛陈北魏朝廷的风俗教化，叔业便派遣儿子裴芬之和自己哥哥的女婿韦伯昕奉表向北魏归附。
真度答书，盛陈朝廷风化。叔业乃遣子芬之及兄女夫韦伯昕奉表内附。
In the reply letter, Zhen Du praised the customs and education of the Northern Wei court. Shuye sent his son Pei Fen and his brother's son-in-law Wei Buxin to submit to Northern Wei.