Gaya APA

Sharpley, A. (1994). Journal Of Environmental Quality Vol. 23 No. 1 January - February 1994 . Madison, Wisconsin, AS: Cooperatively by The American Society Of Agronomy.

Gaya MLA

Sharpley, Andrew. "Journal Of Environmental Quality Vol. 23 No. 1 January - February 1994". Madison, Wisconsin, AS: Cooperatively by The American Society Of Agronomy, 1994. Text.