APA (7th ed.) Citation

Harrell, M. A., & Eckel, E. B. (1939). Ground-water resources of the Holbrook region, Arizona. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Harrell, Marshall A., and Edwin Butt Eckel. Ground-water Resources of the Holbrook Region, Arizona. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1939.

MLA (9th ed.) Citation

Harrell, Marshall A., and Edwin Butt Eckel. Ground-water Resources of the Holbrook Region, Arizona. United States Department of the Interior, Geological Survey, 1939.