APA (7th ed.) Citation

Eckel, E. B. (1939). Geology of some dam sites on the Little Colorado and its tributaries, Arizona. [U.S. Geological Survey].

Chicago Style (17th ed.) Citation

Eckel, Edwin Butt. Geology of Some Dam Sites on the Little Colorado and Its Tributaries, Arizona. [Washington, D.C]: [U.S. Geological Survey], 1939.

MLA (9th ed.) Citation

Eckel, Edwin Butt. Geology of Some Dam Sites on the Little Colorado and Its Tributaries, Arizona. [U.S. Geological Survey], 1939.