Helgeson, E. A. (1957). Methods of weed control. Food and Agriculture Organization of the United Nations.
Style de citation Chicago (17e éd.)Helgeson, Earl A. Methods of Weed Control. Rome: Food and Agriculture Organization of the United Nations, 1957.
Style de citation MLA (9e éd.)Helgeson, Earl A. Methods of Weed Control. Food and Agriculture Organization of the United Nations, 1957.
Attention : ces citations peuvent ne pas être correctes à 100%.