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Ron Panzer, Don Stillwaugh, Rich Gnaedinger, George Derkovitz, 1995. "Prevalence of Remnant Dependence among the Prairie-and Savanna-inhabiting Insects of the Chicago Region", Natural Areas Journal, vol 15, #2, April 1995.
Floyd Swink and Gerould Wilhelm, 1979. Plants of the Chicago Region, 3rd ed. The Morton Arboretum. At Amazon.com
J.E. Weaver, 1968. Prairie Plants and Their Environment, A Fifty-Year Study in the Midwest, University of Nebraska Press. At Amazon.com
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