1. Kuniichi Tawara, ed, Scientific Research of Nippon-Tō, Hitachi Hyōronsha, Tōkyo, 1953.
2. Kuniichi Tawara, ed, Ancient Japanese Ironmaking Process from Iron Sand (Tatara Iron Smelting Method), Maruzen Co., Ltd., Tokyo, 1933.
3. Hiromu Tanimura, “Researches on the Forging of Japanese Swords” First Report, Technology Report of Kyūshu Imperial University (Kℷatu-Ihō) 14, 13 (1939) p. 299–309.