1. Official Methods of Analysis,1980
2. Relationships between cholecalciferol metabolism and growth in chicks as modified by age, breed and diet;Bar;J. Nutr.,1981
3. Multiple range and multiple F tests;Duncan;Biometrics,1955
4. Nutrient Requirements of Poultry,1977
5. Evaluation of the molybdovanadate photometric determination of phosphorus in mixed feeds and mineral supplements;Parks;J. Assoc. Offic. Agric. Chem.,1963