| In his book "Nihon Chokodaihishi Siryo (Reference on Super-Ancient History of Japan)" (published in 1976 by Shin-Jinbutsuoraisha Co., Ltd.), it was expanded to 'koten sisho (four classics),' 'koden shisho (four legends),' 'koshi shisho (four ancient historical documents)' and 'iroku sisho (four miscellaneous records).' |
著書『日本超古代秘史資料』（新人物往来社、1976年）では、「古典四書」「古伝四書」「古史四書」「異録四書」に発展した。 |