{{cite journal | last1=Khattak | first1=F. M. | author2=T. N. Pasha | author3=Z. Hayat | author4=A. Mahmud | year=2006 | title=ENZYMES IN POULTRY NUTRITION | journal=Journal of Animal and Plant Sciences | volume=16 | issue=2 | pages=80-85 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2006-JAPS-209}}