1. Association of Official Agricultural Chemists. Official and Tentative Methods of Analysis. 5th edition. 757 pages. Washington, D.C. 1940.
2. Morrison, F. B. Feeds and Feeding. 20th editiom 1050 pages. Ithaca, New York. 1936. in press.
3. Photosynthesis;Spoehr,1926
4. Determination of Pure Carotene in Plant Tissue;Wall;Indus. and Engin. Chem., Analyt. Ed.,1943