1. Alton, G. G., Jones, L. M. &Pietz, D. E. (1975).Laboratory Techniques in Brucellosis, 2nd edn. WHO, Geneva.
2. Hamada, S., El-Hidik, M., Sherif, I., El-Sawale, H. &Yousef, M. (1963).Journal of Arab Veterinary Medical Association,23, 173–178.
3. Mustafa, A. A., Karim, M. H. &El, A. (1971).Sudan Journal of Veterinary Science and Animal Husbandry,12, 5–8.