Oyekunle, M.; Talabi, A.; Okeowo, A. Serological Status for Newcastle Disease Virus in Unvaccinated Indigenous Chickens in Yewa Division of Ogun State, Nigeria. Int. J. Poult. Sci. 2006, 5 (12), 1119–1122. https://doi.org/10.3923/ijps.2006.1119.1122.