United States. Natural Resources Conservation Service & University of Illinois at Urbana-Champaign. Agricultural Experiment Station. (1999). Soil survey of Pike County, Illinois. The Service.
Chicago Style (17th ed.) CitationUnited States. Natural Resources Conservation Service and University of Illinois at Urbana-Champaign. Agricultural Experiment Station. Soil Survey of Pike County, Illinois. [Washington, D.C.?]: The Service, 1999.
MLA (9th ed.) CitationUnited States. Natural Resources Conservation Service and University of Illinois at Urbana-Champaign. Agricultural Experiment Station. Soil Survey of Pike County, Illinois. The Service, 1999.
Warning: These citations may not always be 100% accurate.