Gaya APA

Johnson, D, E. (1992). Journal Of Environmental Quality Vol. 21 No. 2 April - June 1992 . Madison, Wisconsin, AS: Cooperatively by The American Society Of Agronomy.

Gaya MLA

Johnson, Donald, E.. "Journal Of Environmental Quality Vol. 21 No. 2 April - June 1992". Madison, Wisconsin, AS: Cooperatively by The American Society Of Agronomy, 1992. Text.