APA (7th ed.) Citation

Heisner, F. E., & Elmer, S. L. (2006). Soil survey of Henderson County, Illinois. Natural Resources Conservation Service.

Chicago Style (17th ed.) Citation

Heisner, Frank E., and Steven L. Elmer. Soil Survey of Henderson County, Illinois. [Washington, D.C.]: Natural Resources Conservation Service, 2006.

MLA (9th ed.) Citation

Heisner, Frank E., and Steven L. Elmer. Soil Survey of Henderson County, Illinois. Natural Resources Conservation Service, 2006.