APA (7th ed.) Zitazioa

O'Brien, E. (1964). The essential Plotinus. New American.

Chicago Style (17th ed.) Zitazioa

O'Brien, Elmer. The Essential Plotinus. Chicago: New American, 1964.

MLA (9th ed.) Zitazioa

O'Brien, Elmer. The Essential Plotinus. New American, 1964.