Ibu, O.J., J.O.A. Okoye, E.P. Adulugba, K.F. Chah, S.V.O. Shoyinka, E. Salihu, A.A. Chukwuedo, and S.S. Baba. 2009. “Prevalence of Newcastle Disease Viruses in Wild and Captive Birds in Central Nigeria”. International Journal of Poultry Science 8 (6): 574–578. https://doi.org/10.3923/ijps.2009.574.578.