Khanam, J., Rahman, M.M. , Fakhruzzaman, M. and Rumi, N.A. 2018. Determination of efficacy of different Newcastle disease vaccine used in broiler chickens. Asian-Australasian Journal of Bioscience and Biotechnology. 3, 1 (Apr. 2018), 52–58. DOI:https://doi.org/10.3329/aajbb.v3i1.64753.