"Nihonkoki" (Later Chronicle of Japan), "Shoku Nihonkoki" (Later Chronicle of Japan Continued), "Nihon Sandai Jitsuroku" (Veritable Records of Three Reigns of Japan)", "Nihon Kiryaku" (The Abbreviated History of Japan) and tales and diaries are also important materials.
『日本後紀』、『続日本後紀』、『日本三代実録』、『日本紀略』、そして物語・日記などの書物も当時を知る資料である。