APA (7th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, Swartz, F. M., & Cleaves, A. B. (1939). The Devonian of Pennsylvania: Middle and upper Devonian. Department of Internal Affairs, Topographic and Geologic Survey.

Chicago Style (17th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, Frank McKim Swartz, and Arthur B. Cleaves. The Devonian of Pennsylvania: Middle and Upper Devonian. Harrisburg, Pa.: Department of Internal Affairs, Topographic and Geologic Survey, 1939.

MLA (9th ed.) Citation

Pennsylvania. Bureau of Topographic and Geologic Survey, et al. The Devonian of Pennsylvania: Middle and Upper Devonian. Department of Internal Affairs, Topographic and Geologic Survey, 1939.