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APA Citation Edition CitationWillman, H. B., & Frye, J. C. (1970). Pleistocene stratigraphy of Illinois. State of Illinois Dept. of Registration and Education.
Chicago Citation Edition CitationWillman, H. B., und John Chapman Frye. Pleistocene Stratigraphy of Illinois. Urbana, Ill.: State of Illinois Dept. of Registration and Education, 1970.
MLA Citation Edition CitationWillman, H. B., und John Chapman Frye. Pleistocene Stratigraphy of Illinois. State of Illinois Dept. of Registration and Education, 1970.
