Sultan, Serageldeen, Marwa Hamed, and Nabila Osman. “Evaluation of Protection Efficiency of Different Vaccination Programs Against Velogenic Newcastle Disease Virus in Broiler Chickens: Comparative in Field and in Laboratory Studies”. The Thai Journal of Veterinary Medicine 51, no. 1 (January 28, 2021): 141–150. Accessed January 29, 2022. https://he01.tci-thaijo.org/index.php/tjvm/article/view/247454.