{{cite journal | last1=Tahir | first1=M. A. | author2=M. S. Sardar | author3=M. A. Quddus | author4=M. Ashfaq | year=2008 | title=ECONOMICS OF ZERO TILLAGE TECHNOLOGY OF WHEAT IN RICE-WHEAT CROPPING SYSTEM OF PUNJAB- PAKISTAN | journal=Journal of Animal and Plant Sciences | volume=18 | issue=1 | pages=NA | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2008-JAPS-103}}