APA-ийн эшлэл(7 дахь хэвлэлт)

Williams, D., & Butler, B. (2010). The Tallgrass Prairie Center guide to seed and seedling identification in the Upper Midwest. Published for the Tallgrass Prairie Center by the University of Iowa Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Williams, Dave, ба Brent Butler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. Iowa City: Published for the Tallgrass Prairie Center by the University of Iowa Press, 2010.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Williams, Dave, ба Brent Butler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. Published for the Tallgrass Prairie Center by the University of Iowa Press, 2010.