Cita APA (7th ed.)

Palen, J. J. (2002). The urban world (6th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Palen, J. John. The Urban World. 6th ed. Boston: McGraw-Hill, 2002.

Cita MLA (9th ed.)

Palen, J. John. The Urban World. 6th ed. McGraw-Hill, 2002.