Cita APA (7a ed.)

Ayer, A. J. (1969). The foundations of empirical knowledge. Macmillan.

Cita Chicago Style (17a ed.)

Ayer, A. J. The Foundations of Empirical Knowledge. London: Macmillan, 1969.

Cita MLA (9a ed.)

Ayer, A. J. The Foundations of Empirical Knowledge. Macmillan, 1969.