{{cite journal | last1=Uwah | first1=D. F. | author2=E. B. Effa | author3=L. E. Ekpenyong | author4=I. E. Akpan | year=2013 | title=CASSAVA (Manihot esculenta Crantz) PERFORMANCE AS INFLUENCED BY NITROGEN AND POTASSIUM FERTILIZERS IN UYO, NIGERIA | journal=Journal of Animal and Plant Sciences | volume=23 | issue=2 | pages=550-555 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-235}}