1. Association of Official Agricultural Chemists, 1950. Official Methods of Analysis. Association of Official Agricultural Chemists, Washington 4
2. National Research Council, 1954. Nutrient requirements for domestic animals. No. 1 Nutrient requirements for poultry.
3. Nelson, F., L. S. Jensen and J. McGinnis, 1960. Presented at Informal Poultry Nutrition Conference, held April 10, 1960 in Chicago, Illinois.
4. Phosphorus requirement of turkeys for late growth;Sullivan;Poultry Sci.,1959