{{cite journal | last1=Hassan | first1=F. U. | author2=S. Kaleem | year=2014 | title=INFLUENCE OF SEASONAL DISPARITY ON NPK UPTAKE IN SUNFLOWER | journal=Journal of Animal and Plant Sciences | volume=24 | issue=1 | pages=190-196 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2014-JAPS-28}}