Gaya APA
Hogland, R, E. (1989).
Weed Socience Vol. 37 No. 6 November 1989 .
Madison, Wisconsin, AS:
Weed science Society of america.
Gaya MLA
Hogland, Robert, E..
"Weed Socience Vol. 37 No. 6 November 1989".
Madison, Wisconsin, AS:
Weed science Society of america,
1989.
Text.