Cita APA

United States. Department of Agriculture. Soil Conservation Service. (1994). Keys to soil taxonomy United States Dept. of Agriculture : Soil Conservation Service.

Citación estilo Chicago

United States. Department of Agriculture. Soil Conservation Service. Keys to Soil Taxonomy. 6th ed. [Washington, D.C.]: United States Dept. of Agriculture : Soil Conservation Service, 1994.

Cita MLA

United States. Department of Agriculture. Soil Conservation Service. Keys to Soil Taxonomy. 6th ed. [Washington, D.C.]: United States Dept. of Agriculture : Soil Conservation Service, 1994.