Hussein, Mohammed Abdulkadhum, et al. “ISOLATION AND IDENTIFICATION OF INFECTIOUS BRONCHITIS VIRUS AND EXPERIMENTAL INFECTION IN BROILERS”. Diyala Agricultural Sciences Journal , vol. 10, no. special Issue, Dec. 2018, pp. 290-02, https://journal.djas.uodiyala.edu.iq/index.php/dasj/article/view/3593.