APA (7th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, Berg, T. M., Dolimpio, J. H., & Inners, J. D. (1993). Stratigraphic correlation chart of Pennsylvania (3rd print., slightly rev. 1993.). Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey.

Chicago Style (17th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, Thomas M. Berg, James H. Dolimpio, and Jon D. Inners. Stratigraphic Correlation Chart of Pennsylvania. 3rd print., slightly rev. 1993. [Harrisburg]: Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1993.

MLA (9th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, et al. Stratigraphic Correlation Chart of Pennsylvania. 3rd print., slightly rev. 1993. Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1993.