Muhammed, S. M., M. A. Usman, N. A. Sani, S. Y. Idris, and A. M. Wakawa. 2020. “Retrospective Study of Newcastle Disease Cases Diagnosed at the ?Veterinary Teaching Hospital, Ahmadu Bello University, Zaria, Nigeria”. Sahel Journal of Veterinary Sciences 17 (2):33-37. https://demo.saheljvs.org/index.php/saheljvs/article/view/94.