Bello, A. ., Y. A. Adamu, M. A. Umaru, S. . Garba, A. U. Abdullahi, M. K. Adamu, B. . Saidu, S. . Ukashatu, S. A. Hena, and A. . Mahmuda. “Morphometric Analysis of the Reproductive System of African Zebu Cattle”. Scientific Journal of Zoology, vol. 1, no. 2, Sept. 2012, pp. 31-36, https://www.sjournals.com/index.php/sjz/article/view/1187.