APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

Warning: These citations may not always be 100% accurate.