Cita APA (7a ed.)

Ayer, A. J. (1958). The problem of knowledge. Macmillan.

Cita Chicago Style (17a ed.)

Ayer, A. J. The Problem of Knowledge. London [etc.]: Macmillan, 1958.

Cita MLA (9a ed.)

Ayer, A. J. The Problem of Knowledge. Macmillan, 1958.