Cita APA (7a ed.)
Shupe, J. F., Carroll, A., & Allen, W. L. United States: The Physical Landscape. National Geographic Society.
Cita estilo Chicago (17a ed.)
Shupe, John F., Allen Carroll, y William L. Allen. United States: The Physical Landscape. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Shupe, John F., et al. United States: The Physical Landscape. National Geographic Society.
Precaución: Estas citas no son 100% exactas.