APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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