APA (7th ed.) Citation

Hackett, J. E., & McComas, M. R. (1969). Geology for planning in McHenry County. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Hackett, James E., and Murray R. McComas. Geology for Planning in McHenry County. Urbana: Illinois State Geological Survey, 1969.

MLA (9th ed.) Citation

Hackett, James E., and Murray R. McComas. Geology for Planning in McHenry County. Illinois State Geological Survey, 1969.