{{cite journal | last1=Ayuni | first1=N. | author2=O. Radziah | author3=U. A. A. Naher | author4=Q.A. Panhwar | author5=M. S. Halimi | year=2015 | title=Effect of Nitrogen on Nitrogenase Activity of Diazotrophs and Total Bacterial Population in Rice Soil | journal=Journal of Animal and Plant Sciences | volume=25 | issue=5 | pages=1358-1364 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2015-JAPS-185}}