APA (7th ed.) Citation

Geological Survey (U.S.). (1986). Geology of caves. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Geology of Caves. [Washington, D.C.?]: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.). Geology of Caves. The Survey, 1986.