Sadiq, M.A., J.A. Nwanta, E.C. Okolocha, and A.N. Tijjani. 2010. “Retrospective (2000-2009) Study of Newcastle Disease (ND) Cases in Avian Species in Maiduguri, Borno State, North Eastern Nigeria”. International Journal of Poultry Science 10 (1): 76–81. https://doi.org/10.3923/ijps.2011.76.81.