APA (7th ed.) Citation

Bills, D. J. (2000). Hydrogeology of the regional aquifer near Flagstaff, Arizona, 1994-97. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Bills, Donald J. Hydrogeology of the Regional Aquifer Near Flagstaff, Arizona, 1994-97. Tucson, Arizona: U.S. Department of the Interior, U.S. Geological Survey, 2000.

MLA (9th ed.) Citation

Bills, Donald J. Hydrogeology of the Regional Aquifer Near Flagstaff, Arizona, 1994-97. U.S. Department of the Interior, U.S. Geological Survey, 2000.