APA (7th ed.) Citation

Geological Survey (U.S.) & Zuehls, E. E. (1981). Hydrology of Area 25, Eastern Region, Interior Coal Province, Illinois. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and E. E. Zuehls. Hydrology of Area 25, Eastern Region, Interior Coal Province, Illinois. Urbana, Ill.: U.S. Geological Survey, 1981.

MLA (9th ed.) Citation

Geological Survey (U.S.) and E. E. Zuehls. Hydrology of Area 25, Eastern Region, Interior Coal Province, Illinois. U.S. Geological Survey, 1981.