1. The Elements of the Science of Nutrition;Lusk,1909
2. The Vitamines, authorized translation from 2nd German ed. by Dubin;Kramer,1922
3. G. Casal in Vitamins: A Survey of Present Knowledge, Medical Research Council, Special Report Series No. 167, His Majesty's Stationery Office, London, 1932 p. 176;
4. F. Frapolli in The Vitamins, A Symposium, American Medical Association, Chicago, 1939 p. 308.
5. A. L. Lavoisier in Lusk, ref. 1, p. 18.