Gaya APA

Risley, M, A. (1992). Weed Science Vol. 40 No. 4 October - December 1992 . Madison, Wisconsin, AS: Weed Sciences Society Of America.

Gaya MLA

Risley, Mark, A.. "Weed Science Vol. 40 No. 4 October - December 1992". Madison, Wisconsin, AS: Weed Sciences Society Of America, 1992. Text.