{{cite journal | last1=Zhang | first1=D. | author2=A. Saboor | author3=W. Chen | author4=M. Rizwan3 | year=2020 | title=MEASURING RETURNS TO SCALE AMONG VEGETABLE PRODUCERS UNDER TECHNOLOGICAL CHANGE: AN EVIDENCE FROM CHINA | journal=Journal of Animal and Plant Sciences | volume=30 | issue=2 | pages=475-484 | doi=10.36899/JAPS.2020.2.0042 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=AGECO-19-0017}}