The fact that Takanobu received Toshinari's education can be seen in pieces of tanka exchanged between Gojo no Sanmi Nyudo Toshinari and Takanobu, collected in a section for sedo-ka (a style of tanka) in a book completed around 1204.
隆信が俊成の訓育を受けたことは、五条三位入道俊成と隆信の交わした元久本『隆信集』の旋頭歌の部に見える。