{{cite journal | last1=Ali | first1=Z. | author2=S.S. Ahmad | author3=M.N. Khan | author4=M. Akhtar | year=2007 | title=RECENT RECORDS OF GLOBALLY ENDANGERED WHITE HEADED DUCK OXYURA LEUCOCEPHALA IN PAKISTAN | journal=Journal of Animal and Plant Sciences | volume=17 | issue=2 | pages=0-13 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2007-JAPS-212}}