APA (7th ed.) Citation

Walker, M. B. (1997). Soil survey of McDonough County, Illinois. The Service.

Chicago Style (17th ed.) Citation

Walker, Michael B. Soil Survey of McDonough County, Illinois. [Washington, D.C.?]: The Service, 1997.

MLA (9th ed.) Citation

Walker, Michael B. Soil Survey of McDonough County, Illinois. The Service, 1997.