{{cite journal | last1=Mahmood-ul-Hassan | first1=M. | year=2006 | title=OWLS, AS REGARDED BY THE SCIENTISTS AND AGRICULTURISTS THROUGHT THE WORLD AND IN PAKISTAN | journal=Journal of Animal and Plant Sciences | volume=16 | issue=2 | pages=NA | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2006-JAPS-212}}