Cita APA (7a ed.)

Palmer, A. W. (1999). The Penguin dictionary of twentieth-century history (5th ed.). Penguin Books.

Cita Chicago Style (17a ed.)

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth-century History. 5th ed. Harmondsworth, Middlesex, England ; New York, N.Y., U.S.A.: Penguin Books, 1999.

Cita MLA (8a ed.)

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth-century History. 5th ed. Penguin Books, 1999.