1. Aitken, I., Allan, W. H., Biggs, R. M., Gordon, R. I. and Jordan, F. T. W., 1977. Newcastle disease. In: R. F. Gordon (ed), Poultry Diseases, (Balliere Tindall, London), 81-94
2. Alexander, D. J., 1998. Newcastle disease. In: D. E. Swayne, J. R. Glisson, M. W. Jackwood, J. E. Pearson, W. M. Reed, (eds), A laboratory manual for isolation and identification of avian pathogens, 4th edn., (American Association of Avian Pathologists, Kennett Square, PA), 156-163
3. Allan, W. H. and Gough, R. E., 1974. A standard haemagglutination inhibition test for Newcastle disease (1) A comparison of macro and micro methods, Veterinary Record, 95, 120-123
4. Baba, S. S., Iheanacho, C. C., Idris, J. M., El-Yaguda, A. D., 2006. Food-based Newcastle disease V4 vaccine in guinea fowl (Numida meleagris Galeata Pallas) in Nigeria, Tropical Veterinarian, 24, 37-45
5. Bensink, Z. and Spradbrow P., 1999. Newcastle disease virus strain I-2—a prospective thermostable vaccine for use in developing countries, Veterinary Microbiology, 68, 131-139