Helgeson, E. A. (1957). Methods of weed control. Food and Agriculture Organization of the United Nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHelgeson, Earl A. Methods of Weed Control. Rome: Food and Agriculture Organization of the United Nations, 1957.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHelgeson, Earl A. Methods of Weed Control. Food and Agriculture Organization of the United Nations, 1957.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.