Παραπομπή APA

(1978). Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. U.S.Department of agriculture.

Παραπομπή Chicago Style

Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys. United States: U.S.Department of agriculture, 1978.

Παραπομπή MLA

Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys. U.S.Department of agriculture, 1978.