APA (7th ed.) Citation

Maryland Geological Survey, Cleaves, E. T., Glaser, J. D., & Edwards, J. (1968). Geologic map of Maryland. Maryland Geological Survey.

Chicago Style (17th ed.) Citation

Maryland Geological Survey, Emery T. Cleaves, John D. Glaser, and Jonathan Edwards. Geologic Map of Maryland. [Baltimore]: Maryland Geological Survey, 1968.

MLA (8th ed.) Citation

Maryland Geological Survey, et al. Geologic Map of Maryland. Maryland Geological Survey, 1968.