APA (7th ed.) Citation

Cohen, J. M., & Cohen, M. J. (1991). The Penguin dictionary of quotations. Penguin.

Chicago Style (17th ed.) Citation

Cohen, J. M., and M. J. Cohen. The Penguin Dictionary of Quotations. London: Penguin, 1991.

MLA (8th ed.) Citation

Cohen, J. M., and M. J. Cohen. The Penguin Dictionary of Quotations. Penguin, 1991.