1. Association of Official Agricultural Chemists, 1960. Official Methods of Analysis. 9th ed., Washington, D.C., pp. 292, 293, and 680.
2. Studies of the calcium requirement of the growing chick;Couch;Fed. Proc.,1963
3. Multiple range and multiple F tests;Duncan;Biometrics,1955
4. Effect of protein, energy, and fat content of the ration on calcium utilization;Edwards;Poultry Sci.,1960
5. Studies in calcium requirements of broilers;Edwards;Poultry Sci.,1963