SOIL. Soil taxonomy: A basic system of soil classificationfor making and interpreting soil surveys. Departement of Agriculture.
Citazione stile Chigago Style (17a edizione)SOIL. Soil Taxonomy: A Basic System of Soil Classificationfor Making and Interpreting Soil Surveys. U.S: Departement of Agriculture.
Citatione MLA (9a ed.)SOIL. Soil Taxonomy: A Basic System of Soil Classificationfor Making and Interpreting Soil Surveys. Departement of Agriculture.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.