Não informado. (1883). Bulletin of the United States Geological Survey. U.S. Department of the Interior.
Chicago-viite (17. p.)Não informado. Bulletin of the United States Geological Survey. Washington: U.S. Department of the Interior, 1883.
MLA-viite (8. p.)Não informado. Bulletin of the United States Geological Survey. U.S. Department of the Interior, 1883.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.