Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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