"Kojiki," "Nihonshoki" and "Sendai Kujihongi" (ancient Japanese history) are koten sansho, and koten sansho added with "Kogo-shui" (history of the Inbe clan) is koten shisho.
『古事記』『日本書紀』『先代旧事本紀』（旧事紀）が古典三書、『古語拾遺』を加えて古典四書