Serageldeen Sultan และ Marwa Hamed;Nabila Osman. (2021) Evaluation of protection efficiency of different vaccination programs against velogenic Newcastle disease virus in broiler chickens: Comparative in field and in laboratory studies. <i>The Thai Journal of Veterinary Medicine</i>, <i>51</i>(1), 141.Serageldeen Sultan และ Marwa Hamed;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 (2021):141.Serageldeen Sultan และ Marwa Hamed;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. Chulalongkorn University:ม.ป.ท. 2021.