《汉书·传·楚元王传》
以前博士《书》有欧阳，《春秋》有公羊，《易》则有施、孟，但孝宣皇帝还广泛设立《谷梁春秋》，《梁丘易》，《大小夏侯尚书》，虽然义旨不同，但仍然一起设置。
往者博士《书》有欧阳，《春秋》公羊，《易》则施、孟，然孝宣皇帝犹复广立《穀梁春秋》，《梁丘易》，《大小夏侯尚书》，义虽相反，犹并置之。
In the past, among the Imperial Scholars, Ouyang was in charge of the Book of Documents, Gongyang was in charge of the Spring and Autumn Annals, and Shi and Meng were in charge of the Book of Changes. Even though Emperor Xiaoxuan established the Guliang Commentary on the Spring and Autumn Annals, the Liangqiu Commentary on the Book of Changes, and the Greater and Lesser Xiahou Commentaries on the Book of Documents, and though their meanings were different, they were nevertheless all set up at once.