APA (7th ed.) Citation

Bristol, H. M., & Treworgy, J. D. (1979). The Wabash Valley fault system in southeastern Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Bristol, H. M., and Janis D. Treworgy. The Wabash Valley Fault System in Southeastern Illinois. Urbana: Illinois State Geological Survey, 1979.

MLA (9th ed.) Citation

Bristol, H. M., and Janis D. Treworgy. The Wabash Valley Fault System in Southeastern Illinois. Illinois State Geological Survey, 1979.