{{cite journal | last1=Al-Zaidi | first1=Abdullah A. | author2=Mirza B. Baig | author3=Mohammad Y. Shalaby | author4=Abdulwahaab Hazber | year=2016 | title=LEVEL OF KNOWLEDGE AND ITS APPLICATION BY COFFEE FARMERS IN THE UDEEN AREA, GOVERNORATE OF IBB - REPUBLIC OF YEMEN | journal=Journal of Animal and Plant Sciences | volume=26 | issue=6 | pages=1797-1804 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2016-JAPS-235}}