APA (7th ed.) Citation

Knobel, E. W., Boatright C. B., & Boatright, W. C. (1931). Soil survey of Le Flore County, Oklahoma. U.S. Bureau of Chemistry and Soils.

Chicago Style (17th ed.) Citation

Knobel, E. W., Boatright C. B., and W. C. Boatright. Soil Survey of Le Flore County, Oklahoma. Washington: U.S. Bureau of Chemistry and Soils, 1931.

MLA (9th ed.) Citation

Knobel, E. W., et al. Soil Survey of Le Flore County, Oklahoma. U.S. Bureau of Chemistry and Soils, 1931.