NJenga, J., J. Kiptoon, and C. Mugera. “Comparative Study in Serum Biochemical Changes in Sheep and Goats With Heartwater”. Tanzania Veterinary Journal, vol. 9, no. 1, Mar. 1989, pp. 6-11, http://tvj.sua.ac.tz/vet2/index.php/TVJ/article/view/332.