1. Resistance to parasites affected by fat soluble vitamin A;Ackert;J. Parasit.,1927
2. Nutritional Deficiencies in Livestock;Allman,1954
3. The nutritive value of Indian foods and the planning of satisfactory diets;Aykroyd;Government of India Press, Health Bulletin,1954
4. Diseases and Parasites of Poultry;Barger,1949
5. Vitamin A Physiology and Pathology;Bessey,1939