APA (7th ed.) Citation

Palmer, A. W. (1979). The Penguin Dictionary of Twentieth Century History: 1900-1978. Penguin Books.

Chicago Style (17th ed.) Citation

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth Century History: 1900-1978. Harmondsworth: Penguin Books, 1979.

MLA (9th ed.) Citation

Palmer, Alan Warwick. The Penguin Dictionary of Twentieth Century History: 1900-1978. Penguin Books, 1979.