1. Histologic comparison of the brains of vitamin A-deficient and vitamin E-deficient chicks;Adamstone;Arch. Path.,1947
2. Association of Official Agricultural Chemists 1955. Official Methods of Analysis, 8th edition, p. 812. Washington, D. C.
3. Blood spot incidence in chicken eggs and vitamin A level of the diet;Bearse;Poultry Sci.,1960
4. Selection for increased incidence of blood spots in White Leghorns;Lerner;Poultry Sci.,1951
5. National Research Council 1954. Nutrient requirements for poultry. A report of the Committee on Animal Nutrition. Publication 301.