{{cite journal | last1=Waseem | first1=M. | author2=A. Ali | author3=M. Tahir | author4=K. Mehmood | year=2013 | title=MITIGATIVE EFFECT OF DIVERSE USE OF NITROGEN SOURCES ON BULK DENSITY, ORGANIC MATTER AND GRAIN YIELD OF HYBRID MAIZE | journal=Journal of Animal and Plant Sciences | volume=23 | issue=3 | pages=900-905 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-336}}