“Study Of Chick Embryo Vaccination Against Newcastle And Newcastle With Gumboro: Abdel Ameer H.Zahid , Nawal Salih Jafer , Anton S.AL- Bana”. The Iraqi Journal of Veterinary Medicine 29, no. 2 (December 31, 2005): 81–92. Accessed May 6, 2024. https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/855.