APA aipamena

Helgeson, E. A. (1957). Methods of weed control. Food and Agriculture Organization of the United Nations.

Chicago Style aipamena

Helgeson, Earl A. Methods of Weed Control. Rome: Food and Agriculture Organization of the United Nations, 1957.

MLA aipamena

Helgeson, Earl A. Methods of Weed Control. Food and Agriculture Organization of the United Nations, 1957.