Gaya APA
Hart, S, E. (19991).
Weed Socience Vol. 39 No. 4 October - December 1991 .
Madison, Wisconsin, AS:
Weed science Society of america.
Gaya MLA
Hart, Steve, E..
"Weed Socience Vol. 39 No. 4 October - December 1991".
Madison, Wisconsin, AS:
Weed science Society of america,
19991.
Text.