Geological Survey (U.S.). Reclamation Service. (1907). Specifications. The Service.
Chicago-viite (17. p.)Geological Survey (U.S.). Reclamation Service. Specifications. Washington, D.C.: The Service, 1907.
MLA-viite (8. p.)Geological Survey (U.S.). Reclamation Service. Specifications. The Service, 1907.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.