APA (7th ed.) Citation

Richardson, G. B. (1936). Geology and mineral resources of the Butler and Zelienople quadrangles, Pennsylvania. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Richardson, G. B. Geology and Mineral Resources of the Butler and Zelienople Quadrangles, Pennsylvania. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1936.

MLA (9th ed.) Citation

Richardson, G. B. Geology and Mineral Resources of the Butler and Zelienople Quadrangles, Pennsylvania. United States Department of the Interior, Geological Survey, 1936.