Gaya APA

Frado, R, D. (1989). Weed Socience Vol. 37 No. 1 January 1989 . Madison, Wisconsin, AS: Weed science Society of america.

Gaya MLA

Frado, Rafael, De. "Weed Socience Vol. 37 No. 1 January 1989". Madison, Wisconsin, AS: Weed science Society of america, 1989. Text.