Trimble, D. E. (1980). The geologic story of the Great Plains: A nontechnical description of the origin and evolution of the landscape of the Great Plains. United States Gov.Print.Off.
Chicago-Zitierstil (17. Ausg.)Trimble, Donald E. The Geologic Story of the Great Plains: A Nontechnical Description of the Origin and Evolution of the Landscape of the Great Plains. Washington: United States Gov.Print.Off, 1980.
MLA-Zitierstil (9. Ausg.)Trimble, Donald E. The Geologic Story of the Great Plains: A Nontechnical Description of the Origin and Evolution of the Landscape of the Great Plains. United States Gov.Print.Off, 1980.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.