توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

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.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

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.

توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)

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.