{{cite journal | last1=Ahmad | first1=M. | author2=M. S. Azhar | author3=M. M. Aziz | year=2009 | title=PERFORMANCE OF BUFFALO POPULATION USING TEST DAY MILK YIELD IN PROGENY TESTING PROGRAM AREAS OF DISTRICT GUJRANWALA | journal=Journal of Animal and Plant Sciences | volume=19 | issue=1 | pages=10-12 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2009-JAPS-101}}