1. Anonymous. Code of Federal Regulations, Title 21. Paragraph 121.1199. Fermentation derived milk clotting enzyme.
2. Food chemicals codex, First supplement,1974
3. Livestock slaughter, MTAN 1-2-1,1963
4. Production of manufactured dairy products, Da 2-1,1963
5. Arima, K., and S. Iwasaki. 1964. Milk coagulating enzyme “Microbial Rennet” and method of preparation thereof. U.S. Patent 3,151,039.