APA-referens (7:e uppl.)

Palen, J. J. (1981). The urban world (2nd ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Palen, J. John. The Urban World. 2nd ed. New York: McGraw-Hill, 1981.

MLA-referens (9:e uppl.)

Palen, J. John. The Urban World. 2nd ed. McGraw-Hill, 1981.