{{cite journal | last1=Ashfaq | first1=M. | author2=R. Kousar | author3=M. S. A. Makhdum | author4=J. Nasir | year=2020 | title=EMPIRICAL ANALYSIS OF LIVESTOCK PRODUCTIVITY THROUGH IMPROVED BREEDING IN PUNJAB, PAKISTAN | journal=Journal of Animal and Plant Sciences | volume=30 | issue=6 | pages=1642-1652 | doi=10.36899/JAPS.2020.6.0185 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=AGECO-19-0010}}