United States. Natural Resources Conservation Service, National Technical Committee for Hydric Soils (U.S.), Vasilas, L. M., Hurt, G. W., & Noble, C. V. (2010). Field indicators of hydric soils in the United States: A guide for identifying and delineating hydric soils (Version 7.0, 2010.). U. S. Dept. of Agriculture, Natural Resources Conservation Service.
Chicago Style (17th ed.) CitationUnited States. Natural Resources Conservation Service, National Technical Committee for Hydric Soils (U.S.), L. M. Vasilas, G. W. Hurt, and C. V. Noble. Field Indicators of Hydric Soils in the United States: A Guide for Identifying and Delineating Hydric Soils. Version 7.0, 2010. [Washington, D.C.]: U. S. Dept. of Agriculture, Natural Resources Conservation Service, 2010.
MLA (9th ed.) CitationUnited States. Natural Resources Conservation Service, et al. Field Indicators of Hydric Soils in the United States: A Guide for Identifying and Delineating Hydric Soils. Version 7.0, 2010. U. S. Dept. of Agriculture, Natural Resources Conservation Service, 2010.