APA (7th ed.) Citation

Ahrens, R. J. (1996). Soil survey of Hopi Area, Arizona, parts of Coconino and Navajo counties. The Service.

Chicago Style (17th ed.) Citation

Ahrens, Robert J. Soil Survey of Hopi Area, Arizona, Parts of Coconino and Navajo Counties. [Washington, D.C.?]: The Service, 1996.

MLA (9th ed.) Citation

Ahrens, Robert J. Soil Survey of Hopi Area, Arizona, Parts of Coconino and Navajo Counties. The Service, 1996.