United States Departament of Agriculture, & Natural Resources Conservation Service. (1999). Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. United States Departament of Agriculture : Natural Resources Conservation Service.
Citación estilo ChicagoUnited States Departament of Agriculture, and Natural Resources Conservation Service. Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys. 2nd ed. Washington, DC: United States Departament of Agriculture : Natural Resources Conservation Service, 1999.
Cita MLAUnited States Departament of Agriculture, and Natural Resources Conservation Service. Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys. 2nd ed. Washington, DC: United States Departament of Agriculture : Natural Resources Conservation Service, 1999.