APA (7 वां संस्करण) प्रशस्ति पत्र
Helzer, C. (2010). The ecology and management of prairies in the central United States. Published for The Nature Conservancy by the University of Iowa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Helzer, Chris. The Ecology and Management of Prairies in the Central United States. Iowa City: Published for The Nature Conservancy by the University of Iowa Press, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Helzer, Chris. The Ecology and Management of Prairies in the Central United States. Published for The Nature Conservancy by the University of Iowa Press, 2010.
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