Matovelo, J., and R. Maselle. “A Descriptive Study of Infectious Bursal Disease Episodes in Two Backyard Chicken Flocks in Morogoro - Tanzania”. Tanzania Veterinary Journal, vol. 9, no. 3, Sept. 1989, pp. 87-91, https://tvj.sua.ac.tz/vet2/index.php/TVJ/article/view/345.