APA (7th ed.) Citation

Ayer, A. J. (1957). The problem of knowledge (Reprint.). Penguin Books.

Chicago Style (17th ed.) Citation

Ayer, A. J. The Problem of Knowledge. Reprint. Harmondsworth: Penguin Books, 1957.

MLA (9th ed.) Citation

Ayer, A. J. The Problem of Knowledge. Reprint. Penguin Books, 1957.

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