APA (7th ed.) Citation

Palmer, A. (1979). The Penguin dictionary of twentieth century history. A. Lane.

Chicago Style (17th ed.) Citation

Palmer, Alan. The Penguin Dictionary of Twentieth Century History. London: A. Lane, 1979.

MLA (9th ed.) Citation

Palmer, Alan. The Penguin Dictionary of Twentieth Century History. A. Lane, 1979.