APA (7th ed.) Citation

Willman, H. B., & Frye, J. C. (1970). Pleistocene stratigraphy of Illinois. State of Ill. Department of Registration and Education.

Chicago Style (17th ed.) Citation

Willman, Harold B., and John Chapman Frye. Pleistocene Stratigraphy of Illinois. Urbana, Ill: State of Ill. Department of Registration and Education, 1970.

MLA (9th ed.) Citation

Willman, Harold B., and John Chapman Frye. Pleistocene Stratigraphy of Illinois. State of Ill. Department of Registration and Education, 1970.

Warning: These citations may not always be 100% accurate.