1. Official Methods of Analysis,1980
2. Brenes, J., 1971. Influence of calcium, phosphorus and vitamin D3 on performance and bone metabolism of turkeys. Ph.D. thesis, Univ. Minnesota.
3. Processed poultry regulations (turkeys);Can. Gazette,1978
4. The response of plasma alkaline phosphatase, parathyroids and blood and bone minerals to calcium intake in the fowl;Hurwitz;J. Nutr.,1961
5. Kramer, S. L., and P. E. Waibel, 1978. The vitamin D requirement of turkey breeder hens in cages. Pages 119–123 in Minnesota Turkey Res. Bull.