APA-Zitierstil (7. Ausg.)

Estall, R. C. (1976). A modern geography of the United States: Aspects of life and economy (2.ed.). Penguin Books.

Chicago-Zitierstil (17. Ausg.)

Estall, Robert C. A Modern Geography of the United States: Aspects of Life and Economy. 2.ed. Harmondsworth: Penguin Books, 1976.

MLA-Zitierstil (9. Ausg.)

Estall, Robert C. A Modern Geography of the United States: Aspects of Life and Economy. 2.ed. Penguin Books, 1976.