APA (7th ed.) Citation

Palmer, A. W. (1990). The Penguin dictionary of twentieth-century history (3. ed.). Penguin Books.

Chicago Style (17th ed.) Citation

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth-century History. 3. ed. Harmondsworth u.a: Penguin Books, 1990.

MLA (9th ed.) Citation

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth-century History. 3. ed. Penguin Books, 1990.