L. I. kadhim, M. A. Hussein, and M. S. Abdul-Aziz, “Histopathological changes of trachea in three genetic lines of broilers vaccinated with avian infectious bronchitis virus”, KUFA J Vet Med Sci, vol. 7, no. 1B, pp. 164–171, Oct. 2016, doi: 10.36326/kjvs/2016/v7i1B4251.