Biblioglaphy
- Hirose: Agr. Chem. Soc. Japan. Part 2 (1940).
- Ito and Komori: The Agr. Chem. Soc. Japan. 13 159, 115~116 (1937).
- Wilson: Chemistry of Leather Manufacture, Vol. 2, 2nd Edition, New York (1927).
- Sutermeister-Briihl: Das Kasein. pp. 15~18 (1932) Berlin.