(1976). Listen, reflect, act: With attentive ear courageous heart. s.n..
Chicago Style aipamenaListen, Reflect, Act: With Attentive Ear Courageous Heart. [S.l.: s.n., 1976.
MLA aipamenaListen, Reflect, Act: With Attentive Ear Courageous Heart. s.n., 1976.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.