Gaya APA

Hogland, R, E. (1989). Weed Socience Vol.37 No. 4 July 1989 . Madison, Wisconsin, AS: Weed science Society of america.

Gaya MLA

Hogland, Robert, E.. "Weed Socience Vol.37 No. 4 July 1989". Madison, Wisconsin, AS: Weed science Society of america, 1989. Text.