APA (7th ed.) Citation

Geological Survey (U.S.). (2003). Principal aquifers: [United States] (Rev. 2003.). U.S. Dept. of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.). Principal Aquifers: [United States]. Rev. 2003. Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2003.

MLA (8th ed.) Citation

Geological Survey (U.S.). Principal Aquifers: [United States]. Rev. 2003. U.S. Dept. of the Interior, U.S. Geological Survey, 2003.