APA (7th ed.) Zitazioa
Tournier, P. (1972). Learn to grow old. Harper & Row, Publishers.
Chicago Style (17th ed.) Zitazioa
Tournier, Paul. Learn to Grow Old. New York: Harper & Row, Publishers, 1972.
MLA (9th ed.) Zitazioa
Tournier, Paul. Learn to Grow Old. Harper & Row, Publishers, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.