{{cite journal | last1=Khan | first1=N. | author2=N. W. Khan | author3=S. A. Khan | author4=M. A. Khan | author5=K. B. Marwat | year=2012 | title=COMBINED EFFECT OF NITROGEN FERTILIZERS AND HERBICIDES UPON MAIZE PRODUCTION IN PESHAWAR | journal=Journal of Animal and Plant Sciences | volume=22 | issue=2 | pages=12-17 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2012-JAPS-2003}}