APA (7th ed.) Citation

Ayer, A. J. (1982). Philosophy in the twentieth century. Unwin Paperbacks.

Chicago Style (17th ed.) Citation

Ayer, A. J. Philosophy in the Twentieth Century. London: Unwin Paperbacks, 1982.

MLA (8th ed.) Citation

Ayer, A. J. Philosophy in the Twentieth Century. Unwin Paperbacks, 1982.

Warning: These citations may not always be 100% accurate.