APA (7th ed.) Zitazioa

AYER, A. (1979). The Central questions of philosophy. Macmillan.

Chicago Style (17th ed.) Zitazioa

AYER, A.J. The Central Questions of Philosophy. Calcutta: Macmillan, 1979.

MLA (9th ed.) Zitazioa

AYER, A.J. The Central Questions of Philosophy. Macmillan, 1979.