Não informado. (1973). Journal of research of the United States Geological Survey. U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Não informado. Journal of Research of the United States Geological Survey. Washington: U.S. Geological Survey, 1973.
MLA-Zitierstil (8. Ausg.)Não informado. Journal of Research of the United States Geological Survey. U.S. Geological Survey, 1973.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.