Willman, H. B. (1968). Bibliography and index of Illinois geology through 1965: A contribution to the Illinois sesquicentennial year. Illinois State Geological Survey.
Chicago Style (17th ed.) CitationWillman, H. B. Bibliography and Index of Illinois Geology Through 1965: A Contribution to the Illinois Sesquicentennial Year. Urbana: Illinois State Geological Survey, 1968.
MLA (9th ed.) CitationWillman, H. B. Bibliography and Index of Illinois Geology Through 1965: A Contribution to the Illinois Sesquicentennial Year. Illinois State Geological Survey, 1968.
Warning: These citations may not always be 100% accurate.