Cita APA (7a ed.)

Palmer, A. (1992). The Penguin dictionary of twentieth century history (4th ed.). Penguin Books.

Cita Chicago Style (17a ed.)

Palmer, Alan. The Penguin Dictionary of Twentieth Century History. 4th ed. London: Penguin Books, 1992.

Cita MLA (8a ed.)

Palmer, Alan. The Penguin Dictionary of Twentieth Century History. 4th ed. Penguin Books, 1992.