APA (7th ed.) Citation

O'Grady, J., & Ayer, A. J. (1998). A dictionary of philosophical quotations (repr. ed.). Blackwell Publishers.

Chicago Style (17th ed.) Citation

O'Grady, Jane, and A. J. Ayer. A Dictionary of Philosophical Quotations. repr. ed. Oxford: Blackwell Publishers, 1998.

MLA (8th ed.) Citation

O'Grady, Jane, and A. J. Ayer. A Dictionary of Philosophical Quotations. repr. ed. Blackwell Publishers, 1998.