The Prehistory of Japan by Gerard Groot, Bertram S. KrausWilhelm SchifferMN 8:1/2 (1952) pp. 417–18 → jstor.org/stable/2383020ShareDie Weltanfänge in der Japanischen Mythologie by Franz Kiichi NumazawaThe Changing Map of Asia by W. Gordon East, O. H. K. Spate