APA (7th ed.) Citation

Willman, H. B., & Kolata, D. R. (1978). The Platteville and Galena group in northern Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Willman, H. B., and Dennis R. Kolata. The Platteville and Galena Group in Northern Illinois. Urbana: Illinois State Geological Survey, 1978.

MLA (9th ed.) Citation

Willman, H. B., and Dennis R. Kolata. The Platteville and Galena Group in Northern Illinois. Illinois State Geological Survey, 1978.