Cita APA (7th ed.)

Palen, J. J. (1992). The urban world (4th ed.). McGraw - Hill.

Cita Chicago (17th ed.)

Palen, John J. The Urban World. 4th ed. New York: McGraw - Hill, 1992.

Cita MLA (9th ed.)

Palen, John J. The Urban World. 4th ed. McGraw - Hill, 1992.