{{cite journal | last1=Nadeem | first1=M. A. | author2=A. Tanveer | author3=T. Naqqash | author4=A. J. Jhala | author5=K. Mubeen | year=2013 | title=DETERMINING CRITICAL WEED COMPETITION PERIODS FOR BLACK SEED | journal=Journal of Animal and Plant Sciences | volume=23 | issue=1 | pages=216-221 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-133}}