Barkley, T. M., Flora of the Great Plains Association. Flora of the Great Plains. University Press of Kansas, KS. 1986.
Bruggen, Theodore V. Wildflowers of the Northern Plains and Black Hills. Badlands Natural History Association, SD. 1976.
Courtenay, Booth, James H. Zimmerman. A guide in full color: Wildflowers and Weeds. Van Nostrand Reinhold Company, NY. 1972.
Larson, Gary E., James R. Johnson. Plants of the Black Hills and Bear Lodge Mountain. South Dakota State University, SD. 1999.
William A., Nancy C. Olmstead. The Audubon Society Field Guide to North
American Wildflowers: Eastern Region . Alfred A Knopf Inc.,