APA引文

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引文

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