APA (7th ed.) Citation

Ayer, A. J., & O'Grady, J. (1992). A Dictionary of philosophical quotations. Blackwell Publishers.

Chicago Style (17th ed.) Citation

Ayer, A. J., and Jane O'Grady. A Dictionary of Philosophical Quotations. Oxford: Blackwell Publishers, 1992.

MLA (9th ed.) Citation

Ayer, A. J., and Jane O'Grady. A Dictionary of Philosophical Quotations. Blackwell Publishers, 1992.