{{cite journal | last1=Ali | first1=A. | author2=A. Ahmad | author3=T. Khaliq | author4=J. Akhtar | year=2012 | title=PLANTING DENSITY AND NITROGEN RATES OPTIMIZATION FOR GROWTH AND YIELD OF SUNFLOWER (HELIANTHUS ANNUUS L.) HYBRIDS | journal=Journal of Animal and Plant Sciences | volume=22 | issue=4 | pages=1070-1075 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2012-JAPS-442}}