{{cite journal | last1=Liu | first1=W.C. | author2=B.H. Ou | author3=Y.L. Yuan | author4=C.Y. Sun | author5=M. Xiao | author6=Z.H. Zhao | author7=L.L. An | year=2020 | title=INFLUENCE OF DIETARY BETAINE ON NUTRIENT UTILIZATION AND DIGESTIVE ENZYME ACTIVITY IN YELLOW-FEATHER BROILERS DURING STARTER PHASE | journal=Journal of Animal and Plant Sciences | volume=30 | issue=1 | pages=251-254 | doi=10.36899/JAPS.2020.1.0029 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=AS-19-0059}}