Cita APA (7a ed.)
Birdsall, S. S., & Florin, J. (1992). Outline of american geography: Regional landscapes of the United States (4. ed.). John Wiley & Sons, Inc.
Cita Chicago Style (17a ed.)
Birdsall, Stephen S., y John Florin. Outline of American Geography: Regional Landscapes of the United States. 4. ed. New York: John Wiley & Sons, Inc, 1992.
Cita MLA (9a ed.)
Birdsall, Stephen S., y John Florin. Outline of American Geography: Regional Landscapes of the United States. 4. ed. John Wiley & Sons, Inc, 1992.
Precaución: Estas citas no son 100% exactas.