1. Lillie, R. J., C. A. Denton, M. W. Olsen, and H. R. Bird, 1949. Vitamin B12 assay methods and role in reproduction in chickens. Abstracts of Papers, 116th meeting of American Chemical Society: page 37A.
2. Activity of a vitamin B12 concentrate for chick growth and hatchability;Lindstrom;Poultry Sci.,1949
3. The relation of unidentified factors to the nutrition of the mature domestic fowl;Olcese;Poultry Sci.,1949