Asakura, Haruhiko(朝倉治彦). 神話伝説事典. 東京堂出版, 1963. ISBN 978-4-490-10033-4., p.198. quote:"ごだいおとぎぱなし（五大御伽話）。五大昔話ともいう。桃太郎、猿蟹合戦、舌切雀、花咲爺、かちかち山の五話"
Yanagita, Kunio(柳田國男). Collected Works (柳田國男全集). Tsukuma Shobo, 1998. ISBN 9784480750662., p.253, says calling them otogibanashi (see below) is a misnomer, since they are mukashi banashi (Yanagita's preferred term for folktales orally transmitted)
