McKenna, S. L., Keefe, G. P., Tiwari, A., VanLeeuwen, J., & Barkema, H. W. (2006). Johne’s disease in Canada Part II: Disease impacts, risk factors, and control programs for dairy producers. Canadian Veterinary Medical Association.

McKenna, Shawn L.B., Greg P. Keefe, Ashwani Tiwari, John VanLeeuwen, und Herman W. Barkema. Johne’s Disease in Canada Part II: Disease Impacts, Risk Factors, and Control Programs for Dairy Producers. Canadian Veterinary Medical Association, 2006.

McKenna, Shawn L.B., et al. Johne’s Disease in Canada Part II: Disease Impacts, Risk Factors, and Control Programs for Dairy Producers. Canadian Veterinary Medical Association, 2006.