Mmbaga, A., R. Nkya, and L. Kurwijila. “The Potentiality of Using Bull Semen at Room Temperature After Short Term Preservation in Different Extenders”. Tanzania Veterinary Journal, vol. 20, no. 1, Mar. 2000, pp. 17-26, http://tvj.sua.ac.tz/vet2/index.php/TVJ/article/view/426.