Perrett, Tye, Brian K. Wildman, Sameeh M. Abutarbush, Tom J. Pittman, Corey R. Jones, Colleen M. Pollock, Oliver C. Schunicht, P. Timothy Guichon, G. Kee Jim, and Calvin W. Booker. 2008. “A Comparison of Two Mannheimia Haemolytica Immunization Programs in Feedlot Calves at High Risk of Developing Undifferentiated Fever/Bovine Respiratory Disease”. The Bovine Practitioner 42 (1):64-75. https://doi.org/10.21423/bovine-vol42no1p64-75.