Estall, R. C. (1972). A modern geography of the United States: Aspects of life and economy (1. American ed.). Quadrangle Books.
Chicago-Zitierstil (17. Ausg.)Estall, Robert C. A Modern Geography of the United States: Aspects of Life and Economy. 1. American ed. Chicago: Quadrangle Books, 1972.
MLA-Zitierstil (9. Ausg.)Estall, Robert C. A Modern Geography of the United States: Aspects of Life and Economy. 1. American ed. Quadrangle Books, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.