APA (7th ed.) Citation

Williams, D. R., & McElroy, T. A. (1997). Water resources of Indiana County, Pennsylvania. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Williams, Donald R., and Thomas A. McElroy. Water Resources of Indiana County, Pennsylvania. Lemoyne, Pennsylvania: U.S. Geological Survey, 1997.

MLA (9th ed.) Citation

Williams, Donald R., and Thomas A. McElroy. Water Resources of Indiana County, Pennsylvania. U.S. Geological Survey, 1997.