APA (7th ed.) Citation

Illinois State Water Survey & Illinois State Geological Survey. (1981). Cooperative groundwater report. State Water Survey [and] State Geological Survey.

Chicago Style (17th ed.) Citation

Illinois State Water Survey and Illinois State Geological Survey. Cooperative Groundwater Report. Champaign, Ill.: State Water Survey [and] State Geological Survey, 1981.

MLA (9th ed.) Citation

Illinois State Water Survey and Illinois State Geological Survey. Cooperative Groundwater Report. State Water Survey [and] State Geological Survey, 1981.