APA (7th ed.) Citation

Purkey, T. H. (1986). Soil survey of Kent County, Michigan. The Service.

Chicago Style (17th ed.) Citation

Purkey, Thomas H. Soil Survey of Kent County, Michigan. [Washington, D.C.?]: The Service, 1986.

MLA (9th ed.) Citation

Purkey, Thomas H. Soil Survey of Kent County, Michigan. The Service, 1986.