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2. Vitamin A of Butter;Morton;Biochem J.,1930
3. Vitamin A and Carotin IX. Notes on the Conversion of Carotin to Vitamin A in the Cow;Moore;Biochem. J.,1932
4. Vitamin Potency of Cod Liver Oils. XI. Butter Fats Produced on Summer Feed;Holmes;Ind. Eng. Chem.,1924
5. Davis, H. P., and Hathaway, I. L. “The Vitamin A Content of Milk of Holstein, Ayrshire, Jersey and Guernsey Cows.” Nebraska Agric. Exper. Sta. Bulletin No. 54, Feb. 1931.