APA (7th ed.) Citation

Epis, R. C., Wobus, R. A., & Scott, G. R. (1979). Geologic map of the Guffey quadrangle, Park County, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Epis, Rudy C., Reinhard A. Wobus, and Glenn R. Scott. Geologic Map of the Guffey Quadrangle, Park County, Colorado. Reston, Va.: The Survey, 1979.

MLA (9th ed.) Citation

Epis, Rudy C., et al. Geologic Map of the Guffey Quadrangle, Park County, Colorado. The Survey, 1979.