APA (7th ed.) Citation

Ayer, A. J. (1984). Philosophy in the twentieth century (1. publ.). Unwin Paperbacks.

Chicago Style (17th ed.) Citation

Ayer, Alfred J. Philosophy in the Twentieth Century. 1. publ. London: Unwin Paperbacks, 1984.

MLA (9th ed.) Citation

Ayer, Alfred J. Philosophy in the Twentieth Century. 1. publ. Unwin Paperbacks, 1984.