Morter, R. L., H. E. Amstutz, and R. A. Crandell. “Clinical Evaluation of Prophylactic Regimens for Bovine Respiratory Disease”. The Bovine Practitioner, vol. 1982, no. 17, Nov. 1982, pp. 56-58, doi:10.21423/bovine-vol1982no17p56-58.