Butler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
Chicago Style (17th ed.) CitationButler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
MLA (8th ed.) CitationButler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
Warning: These citations may not always be 100% accurate.