APA (7th ed.) Citation

Eckmann, E. C., Baldwin, M., & Carpenter, E. J. (1920). Soil survey of the middle Gila Valley area, Arizona. Government Printing Office.

Chicago Style (17th ed.) Citation

Eckmann, E. C., Mark Baldwin, and Eugene Johnson Carpenter. Soil Survey of the Middle Gila Valley Area, Arizona. Washington: Government Printing Office, 1920.

MLA (9th ed.) Citation

Eckmann, E. C., et al. Soil Survey of the Middle Gila Valley Area, Arizona. Government Printing Office, 1920.