McAllister, T. A., Olson, M. E., Fletch, A., Wetzstein, M., & Entz, T. (2005). Prevalence of Giardia and Cryptosporidium in beef cows in southern Ontario and in beef calves in southern British Columbia. Canadian Veterinary Medical Association.

McAllister, Tim A., Merle E. Olson, Andy Fletch, Merv Wetzstein, och Toby Entz. Prevalence of Giardia and Cryptosporidium in Beef Cows in Southern Ontario and in Beef Calves in Southern British Columbia. Canadian Veterinary Medical Association, 2005.

McAllister, Tim A., et al. Prevalence of Giardia and Cryptosporidium in Beef Cows in Southern Ontario and in Beef Calves in Southern British Columbia. Canadian Veterinary Medical Association, 2005.