Schkeeper , Amy E., Robert C. Cole, William R. Brawner, Julie A. Gard, Herris S. Maxwell, and Misty A. Edmondson. “Ultrasound Anatomy of the Penis in Normal Bos Taurus Bulls”. Clinical Theriogenology 9, no. 4 (December 1, 2017): 545-561. Accessed May 31, 2026. https://clinicaltheriogenology.net/index.php/CT/article/view/10004.