Journal article reprint from: Poultry Science, v.36:no.5 (1957:Sept.).
Journal article reprint from: Poultry Science, v.36:no.1 (1957:Jan.).
Journal article reprint from: American Journal of Veterinary Research, v.18:no.69 (1957:Oct.).
Journal article reprint from: American Journal of Veterinary Research, v.18:no.66 (1957:Jan.).
Journal article reprint from: Antibiotics annual, 1957/1958.
Journal article reprint from: United States Livestock Sanitary Association. Annual proceedings, 62nd (1958).
Journal article reprint from: Poultry Science, v.37:no.3 (1958:May).
Journal article reprint from: Journal of the American Veterinary Medical Association, v.132:no.11 (1958:June 1).