APA (7th ed.) Citation

Black, J., & Porter, R. (1996). The Penguin dictionary of eighteenth century history. Penguin.

Chicago Style (17th ed.) Citation

Black, Jeremy, and Roy Porter. The Penguin Dictionary of Eighteenth Century History. London: Penguin, 1996.

MLA (9th ed.) Citation

Black, Jeremy, and Roy Porter. The Penguin Dictionary of Eighteenth Century History. Penguin, 1996.