A. Elkomy, M. Aboubakr, F. Elsayed, E. Emam, and M. Kassem, “Immunological status in broiler chickens vaccinated with newcastle vaccine and treated with cephradine”, IJPT, vol. 7, no. 2, pp. 22–28, Jul. 2019, doi: 10.14419/ijpt.v7i2.29194.