Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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