S. M. . Muhammed, M. A. . Usman, N. A. . Sani, S. Y. . Idris, and A. M. . Wakawa, “Retrospective Study of Newcastle Disease Cases Diagnosed at the ?Veterinary Teaching Hospital, Ahmadu Bello University, Zaria, Nigeria”, SJVS, vol. 17, no. 2, pp. 33–37, Jun. 2020.