Cita APA (7th ed.)

Ayer, A. J. (1979). The Central Questions of Philosophy (Reprint ed.). Penguin Books.

Cita Chicago (17th ed.)

Ayer, A. J. The Central Questions of Philosophy. Reprint ed. Harmondsworth: Penguin Books, 1979.

Cita MLA (9th ed.)

Ayer, A. J. The Central Questions of Philosophy. Reprint ed. Penguin Books, 1979.