Gaya APA

Service, U, S, D, O, A, N, R, C. (1999). Soil Taxonomy A Basic System of Soil Classification for Making and Interpreting Soil Surveys (2nd). : United States Departement of Agriculture Natural Resources Conservation Service.

Gaya MLA

Service, United, States, Departement, Of, Agriculture, Natural, Resources, Conservation. "Soil Taxonomy A Basic System of Soil Classification for Making and Interpreting Soil Surveys". 2nd : United States Departement of Agriculture Natural Resources Conservation Service, 1999. Text.