Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
The field of knowledge on the subject of vitamins in poultry nutrition has become too broad to be covered adequately in one short paper. The practicing veterinarian is concerned chiefly with the symptoms of the various avitaminoses, differential diagnosis, methods of prevention and practical sources of the various vitamins to be used in either prevention or alleviation of the syndromes of each. In this paper, an attempt will be made to present some of this information in very brief form.
Wilke, H. L.
"Vitamins In Poultry Nutrition,"
Iowa State University Veterinarian: Vol. 2
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol2/iss3/8