APA Style

Soil taxonomy : a basic system of soil classification for making and interpreting soil surveys. (1975). WASHINGTON, DC: U.S. Dept. of Agriculture, Natural Resources Conservation Service.

MLA Style

Soil taxonomy : a basic system of soil classification for making and interpreting soil surveys. 2nd ed. WASHINGTON, DC: U.S. Dept. of Agriculture, Natural Resources Conservation Service, 1975. Text.