Não informado. (2014). Geological Survey Professional Paper. U.S. Geological Survey Professional Paper.
Chicago-Zitierstil (17. Ausg.)Não informado. Geological Survey Professional Paper. Washington: U.S. Geological Survey Professional Paper, 2014.
MLA-Zitierstil (8. Ausg.)Não informado. Geological Survey Professional Paper. U.S. Geological Survey Professional Paper, 2014.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.