United States. Soil Conservation Service, University of Florida. Soil Science Department, & Florida. Department of Agriculture and Consumer Services. (1990). Soil survey of Polk County, Florida. The Service.
Chicago Style (17th ed.) CitationUnited States. Soil Conservation Service, University of Florida. Soil Science Department, and Florida. Department of Agriculture and Consumer Services. Soil Survey of Polk County, Florida. [Washington, D.C.?]: The Service, 1990.
MLA (9th ed.) CitationUnited States. Soil Conservation Service, et al. Soil Survey of Polk County, Florida. The Service, 1990.
Warning: These citations may not always be 100% accurate.