{{cite journal | last1=Khan | first1=K. | author2=T. Yaqub | author3=M. Z. Shabbir | author4=A. Aslam | year=2021 | title=PREVALENCE OF AVIAN INFLUENZA SUBTYPE H9N2 IN BACKYARD POULTRY IN AND AROUND BAHAWALPUR CITY | journal=Journal of Animal and Plant Sciences | volume=31 | issue=6 | pages=1873-1878 | doi=10.36899/JAPS.2021.6.0393 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=VS-20-0041}}