Cita APA (7a ed.)

United States. Natural Resources Conservation Service. Soil Survey Staff. (1998). Keys to soil taxonomy (8th. ed.). Department of Agriculture.

Cita Chicago Style (17a ed.)

United States. Natural Resources Conservation Service. Soil Survey Staff. Keys to Soil Taxonomy. 8th. ed. Washington: Department of Agriculture, 1998.

Cita MLA (8a ed.)

United States. Natural Resources Conservation Service. Soil Survey Staff. Keys to Soil Taxonomy. 8th. ed. Department of Agriculture, 1998.