APA (7th ed.) Citation

Elmer, S. L. (2005). Soil survey of Knox County, Illinois. Natural Resources Conservation Service.

Chicago Style (17th ed.) Citation

Elmer, Steven L. Soil Survey of Knox County, Illinois. [Washington, D.C.]: Natural Resources Conservation Service, 2005.

MLA (9th ed.) Citation

Elmer, Steven L. Soil Survey of Knox County, Illinois. Natural Resources Conservation Service, 2005.

Warning: These citations may not always be 100% accurate.