APA-ийн эшлэл(7 дахь хэвлэлт)

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.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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.

MLA -ийн эшлэл (9 дэх хэвлэлт)

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.