《汉书·传·司马迁传》
宣帝时，司马迁的外孙平通侯杨惮最先开始陈述司马迁的著作，于是得以公布开来。
宣帝时，迁外孙平通侯杨惲祖述其书，遂宣布焉。
During the reign of Emperor Xuan, Sima Qian's maternal grandson, Pingtong Marquess Yang Dan, was the first to present Sima Qian's writings, which were then made public.