APA (7th ed.) Zitazioa
Santayana, G. (1962). Reason in religion. Collier Books.
Chicago Style (17th ed.) Zitazioa
Santayana, George. Reason in Religion. New York: Collier Books, 1962.
MLA (9th ed.) Zitazioa
Santayana, George. Reason in Religion. Collier Books, 1962.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.