1. U.S. Department of Health (1963) “Milk Ordinance and Code”. (Washington, D.C., U.S.A.).
2. “Richmond's Dairy Chemistry”;Davis,1953
3. “A Textbook of Dairy Chemistry”;Ling,1956
4. A.O.A.C. (1965) “Methods of Analysis of the Association of Official Agricultural Chemists”. (New York, U.S.A.).
5. American Public Health Association & A.O.A.C. (1960) “Standard Methods for the Examination of Dairy Products. Microbiological and Chemical”, 11th Ed. (A.P.H.A., New York).