APA (7th ed.) Citation

Heigold, P. C. (1990). Seismic reflection and seismic refraction surveying in northeastern Illinois. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Heigold, Paul C. Seismic Reflection and Seismic Refraction Surveying in Northeastern Illinois. Champaign, Ill: Illinois State Geological Survey, 1990.

MLA (9th ed.) Citation

Heigold, Paul C. Seismic Reflection and Seismic Refraction Surveying in Northeastern Illinois. Illinois State Geological Survey, 1990.