APA (7th ed.) Citation

Poulson, E. N., & Youngs, F. O. (1938). Soil survey of the upper Gila valley area, Arizona. [U.S. Govt. Print. Off].

Chicago Style (17th ed.) Citation

Poulson, E. N., and F. O. Youngs. Soil Survey of the Upper Gila Valley Area, Arizona. Washington: [U.S. Govt. Print. Off], 1938.

MLA (9th ed.) Citation

Poulson, E. N., and F. O. Youngs. Soil Survey of the Upper Gila Valley Area, Arizona. [U.S. Govt. Print. Off], 1938.