APA (7th ed.) Citation

Roberts, A. E. (1964). Geology of the Hoppers quadrangle, Montana. The Survey.

Chicago Style (17th ed.) Citation

Roberts, Albert Eugene. Geology of the Hoppers Quadrangle, Montana. Reston, Va.: The Survey, 1964.

MLA (9th ed.) Citation

Roberts, Albert Eugene. Geology of the Hoppers Quadrangle, Montana. The Survey, 1964.

Warning: These citations may not always be 100% accurate.