1. Allen, R. S., 1952. Ames, Iowa. (Private communication.)
2. Association of Official Agricultural Chemists, 1945. Methods of Analysis, 6th edition.
3. Unidentified chick growth factors in vegetable oils and fatty acid concentrates;Carver;Poultry Sci.,1953
4. The Chemical Constitution of Natural Fats;Hilditch,1947
5. Chemical tests for the detection of rancidity;Kerr;Ind. Eng. Chem.,1918