APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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