Fox, E. W., D. Hobbs, J. Stinson, and G. M. Rogers. “A Preliminary Survey of North Carolina Slaughterhouse Bulls for Tritrichomonas Foetus”. The Bovine Practitioner, vol. 1995, no. 29, Sept. 1995, pp. 153-5, doi:10.21423/bovine-vol1995no29p153-155.