1. Cogen, T.:The Haven of Health (1936), quoted in Ling, E. R.: A Textbook of Dairy Chemistry. 3rd rev. ed. New York: Philosophical Library Inc. (1957) I, 1.
2. Oser, B. L.: (ed.), Hawk’s Physiological Chemistry. 14th ed. New York: Blakeston Div., McGraw-Hill Book Company (1965). 369.
3. Ibid., 371.
4. Ling, E. R.:A Textbook of Dairy Chemistry. 3rd ed. New York: Philosophical Library (1957). I, 12, 15.
5. Ibid. 33.