Butler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रButler. The Tallgrass Prairie Center Guide to Seed and Seedling Identification in the Upper Midwest. University of Iowa Press.
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