APA (7th ed.) Citation

Ward, L. W., & Blackwelder, B. W. (1980). Stratigraphic revision of upper Miocene and lower Pliocene beds of the Chesapeake group, middle Atlantic Coastal Plain. Dept. of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Ward, Lauck W., and Blake W. Blackwelder. Stratigraphic Revision of Upper Miocene and Lower Pliocene Beds of the Chesapeake Group, Middle Atlantic Coastal Plain. [Reston, Va.]: Dept. of the Interior, Geological Survey, 1980.

MLA (9th ed.) Citation

Ward, Lauck W., and Blake W. Blackwelder. Stratigraphic Revision of Upper Miocene and Lower Pliocene Beds of the Chesapeake Group, Middle Atlantic Coastal Plain. Dept. of the Interior, Geological Survey, 1980.