1. T. W. Keenan, D. P. Dylewski, T. A. Woodford and R. H. Ford, “Development in Dairy Chemistry,” Vol. 2, ed. by P. F. Fox, Applied Science Publ., London, 1983, pp. 83–118.
2. “Official Methods of Analysis of the Association of Official Agricultural Chemists,” 20th Ed., ed. by W. Horwitz, George Benta Co., Inc., Menasha, Wisconsin, 1980, 24.002.
3. J. R. Brunner, “Fundamentals of Dairy Chemistry,” ed. by R. H. Webb, A. H. Johnson and J. A. Alford, AVI Publishing Co., Inc., Connecticut, 1974, pp. 474–602.