Departament of the Interior. (1974). Earth manual: A water resources technical publication (2a. ed.). United States Government Printing Office.
Cita Chicago (17th ed.)Departament of the Interior. Earth Manual: A Water Resources Technical Publication. 2a. ed. Washington, D.C: United States Government Printing Office, 1974.
Cita MLA (9th ed.)Departament of the Interior. Earth Manual: A Water Resources Technical Publication. 2a. ed. United States Government Printing Office, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.