Cita APA

Ayer, A. J. (1956). The problem of knowledge. Penguin Books.

Citación estilo Chicago

Ayer, A. J. The Problem of Knowledge. Harmondsworth, Middlesex: Penguin Books, 1956.

Cita MLA

Ayer, A. J. The Problem of Knowledge. Penguin Books, 1956.

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