(1975). Geologic map of the West Middletown quadrangle, and part of the Bethany quadrangle, Washington County, Pennsylvania. U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Geologic Map of the West Middletown Quadrangle, and Part of the Bethany Quadrangle, Washington County, Pennsylvania. Reston, VA: U.S. Geological Survey, 1975.
MLA-Zitierstil (9. Ausg.)Geologic Map of the West Middletown Quadrangle, and Part of the Bethany Quadrangle, Washington County, Pennsylvania. U.S. Geological Survey, 1975.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.