APA-Zitierstil (7. Ausg.)
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.
Chicago-Zitierstil (17. Ausg.)
Williams, Dave, und 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-Zitierstil (9. Ausg.)
Williams, Dave, und 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.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.