Cita APA (7th ed.)

Dunbar, G. S. (1991). Modern geography: An encyclopedic survey. Garland.

Cita Chicago (17th ed.)

Dunbar, Gary S. Modern Geography: An Encyclopedic Survey. New York: Garland, 1991.

Cita MLA (9th ed.)

Dunbar, Gary S. Modern Geography: An Encyclopedic Survey. Garland, 1991.