APA (7th ed.) Citation

Williams, J. H., & Eckhardt, D. A. (1987). Groundwater resources of the Berwick-Bloomsburg-Danville area, east-central Pennsylvania. Pennsylvania Geological Survey : May be purchased from State Book Store.

Chicago Style (17th ed.) Citation

Williams, John H., and David A. Eckhardt. Groundwater Resources of the Berwick-Bloomsburg-Danville Area, East-central Pennsylvania. Harrisburg: Pennsylvania Geological Survey : May be purchased from State Book Store, 1987.

MLA (9th ed.) Citation

Williams, John H., and David A. Eckhardt. Groundwater Resources of the Berwick-Bloomsburg-Danville Area, East-central Pennsylvania. Pennsylvania Geological Survey : May be purchased from State Book Store, 1987.