APA
U.S. Department of Agriculture S. C. S., . (1972). Soil Survey Laboratory Methods and Procedures for Collecting Soil Samples. U.S. Department of Agriculture, Soil Conservation Service: U.S.A.
Chicago
U.S. Department of Agriculture Soil Conservation Service, . 1972. Soil Survey Laboratory Methods and Procedures for Collecting Soil Samples. U.S. Department of Agriculture, Soil Conservation Service: U.S.A.
Harvard
U.S. Department of Agriculture S. C. S., . (1972). Soil Survey Laboratory Methods and Procedures for Collecting Soil Samples. U.S. Department of Agriculture, Soil Conservation Service: U.S.A.
MLA
U.S. Department of Agriculture Soil Conservation Service, . Soil Survey Laboratory Methods and Procedures for Collecting Soil Samples. U.S. Department of Agriculture, Soil Conservation Service: U.S.A. 1972.
