1. C. A. Emstrom, “Fundamentals of Dairy Chemistry,” 2nd ed., ed. by B. H. Webb, A. H. Johnson and J. A. Alford, the Avi Pub. Co., Inc., Westport, Connecticut, 1974, p. 662.
2. R. Jenness and S. Patton, “Principles of Dairy Chemistry,” John Wiley & Sons, Inc., New York,1959, p. 316.