Max, R., Gwakisa, P., & Rugaimukamu, E. (1997). Concerted Immunological Responses to Newcastle Disease Virus and Sheep Red Blood Cells In Chickens Supplemented With Different Levels of Vitamins C and E. Tanzania Veterinary Journal, 17(4), 104–113. Retrieved from http://tvj.sua.ac.tz/vet2/index.php/TVJ/article/view/469