1. Association of American Feed Control Officials, Official Publication. 1952, p. 16.
2. Association of Official Agricultural Chemists, Methods of Analysis. 1940, pp. 371-373.
3. Use of toes rather than tibiae in A.O.A.C. chick method of vitamin D determination;Baird;J. Assoc. Off. Agr. Chem.,1942
4. Phosphate supplements of different fluorine content as sources of phosphorus for chickens;Gerry;Poultry Sci.,1947
5. Biological availability of inorganic phosphates;Gillis;Poultry Sci.,1951