APA (7th ed.) Citation

Illinois State Geological Survey & Weibel, C. P. (1993). Geology of the Waltersburg Quadrangle, Pope County, Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Illinois State Geological Survey and C. Pius Weibel. Geology of the Waltersburg Quadrangle, Pope County, Illinois. Champaign, IL: Illinois State Geological Survey, 1993.

MLA (9th ed.) Citation

Illinois State Geological Survey and C. Pius Weibel. Geology of the Waltersburg Quadrangle, Pope County, Illinois. Illinois State Geological Survey, 1993.