1. Berg, Lawrence R., 1941. The effect of varying levels of calcium intake on the calcium balance, shell thickness, and blood calcium level of White Leghorn pullets. Thesis, Kansas State College of Agriculture and Applied Science.
2. A comparison of two methods of supplying calcium to laying pullets;Berg;Wash. Agri. Exp. Sta. Bull.,1944
3. The availability of calcium in calcium salts and minerals for bone formation in the growing chick;Bethke;Poultry Sci.,1929
4. Calcium, phosphorus, and vitamin D interrelationships in the nutrition of the growing chick;Carver;Poultry Sci.,1946
5. Observations on the mineral metabolism of pullets;Common;Jour, of Agri. Sci.,1933