APA (7th ed.) Citation

Palmer, A. W. (1962). A dictionary of modern history: 1789-1945. Penguin Books.

Chicago Style (17th ed.) Citation

Palmer, Alan Warwick. A Dictionary of Modern History: 1789-1945. Harmondsworth: Penguin Books, 1962.

MLA (9th ed.) Citation

Palmer, Alan Warwick. A Dictionary of Modern History: 1789-1945. Penguin Books, 1962.