Citazione Stile APA (7a Edizione)

Soil Survey Staff. (2006). Keys to soil taxonomy (10a. ed.). United States Department of Agriculture. Natural Resources Conservation Service.

Citazione stile Chigago Style (17a edizione)

Soil Survey Staff. Keys to Soil Taxonomy. 10a. ed. Washington, D.C: United States Department of Agriculture. Natural Resources Conservation Service, 2006.

Citatione MLA (9a ed.)

Soil Survey Staff. Keys to Soil Taxonomy. 10a. ed. United States Department of Agriculture. Natural Resources Conservation Service, 2006.