{{cite journal | last1=Farhad | first1=W. | author2=M. F. Saleem | author3=M. A. Cheema | author4=H. M. Hammad | year=2009 | title=EFFECT OF POULTRY MANURE LEVELS ON THE PRODUCTIVITY OF SPRING MAIZE (Zea mays L.) | journal=Journal of Animal and Plant Sciences | volume=19 | issue=3 | pages=122-125 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2009-JAPS-314}}