APA (7th ed.) Citation

United States. Natural Resources Conservation Service. (2019). Soil colors of the continental United States. Uniited States Department of Agriculture, Natural Resources Conservation Service.

Chicago Style (17th ed.) Citation

United States. Natural Resources Conservation Service. Soil Colors of the Continental United States. [Washington, D.C.]: Uniited States Department of Agriculture, Natural Resources Conservation Service, 2019.

MLA (9th ed.) Citation

United States. Natural Resources Conservation Service. Soil Colors of the Continental United States. Uniited States Department of Agriculture, Natural Resources Conservation Service, 2019.