Sparwasser, W. A., Bogard, V. A., & Henson, O. G. (1968). Soil survey, Okmulgee County, Oklahoma. Washington]: U.S. Dept. of Agriculture, Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.].
Chicago Style CitationSparwasser, W. A., Vinson A. Bogard, and Odos G. Henson. Soil Survey, Okmulgee County, Oklahoma. Washington]: U.S. Dept. of Agriculture, Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
MLA CitationSparwasser, W. A., Vinson A. Bogard, and Odos G. Henson. Soil Survey, Okmulgee County, Oklahoma. Washington]: U.S. Dept. of Agriculture, Soil Conservation Service; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1968.
Warning: These citations may not always be 100% accurate.