APA (7th ed.) Citation

Ayer, A. J. (1956). The problem of knowledge. Macmillan ; St. Martin's.

Chicago Style (17th ed.) Citation

Ayer, A. J. The Problem of Knowledge. London : New York: Macmillan ; St. Martin's, 1956.

MLA (9th ed.) Citation

Ayer, A. J. The Problem of Knowledge. Macmillan ; St. Martin's, 1956.