APA (7th ed.) Citation

Roberts, A. E. (1964). Geologic map of the Fort Ellis quadrangle, Montana. The Survey.

Chicago Style (17th ed.) Citation

Roberts, Albert Eugene. Geologic Map of the Fort Ellis Quadrangle, Montana. Washington, D.C.: The Survey, 1964.

MLA (9th ed.) Citation

Roberts, Albert Eugene. Geologic Map of the Fort Ellis Quadrangle, Montana. The Survey, 1964.