1. McGinnis, James, E. L. Stephenson, B. T. H. Levadie and J. S. Carver, 1949. Response of chicks and turkey poults to vitamin B12 supplements produced by fermentation with different organisms. Abs., 116th Meeting, Amer. Chem. Soc., Sept., 1949, p. 42A.
2. Energy, protein and unidentified vitamins in poult nutrition;Scott;Poultry Sci.,1948
3. Stokstad, E. L. R., and T. H. Jukes, 1950. Vitamin B12 and some of its interrelationships. Abs., 117th Meeting, Amer. Chem. Soc., April, 1950, p. 12A.