Palen, J. J. (2002). The urban world (6th ed.). Boston: McGraw-Hill.
Trích dẫn kiểu ChicagoPalen, J. John. The Urban World. 6th ed. Boston: McGraw-Hill, 2002.
Deismireacht MLAPalen, J. John. The Urban World. 6th ed. Boston: McGraw-Hill, 2002.
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