APA (7th ed.) Zitazioa
Frick, D. M. (2004). Robert K. Greenleaf: A life of servant leadership. Berrett-Koehler Publishers.
Chicago Style (17th ed.) Zitazioa
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. San Francisco, Calif.: Berrett-Koehler Publishers, 2004.
MLA (9th ed.) Zitazioa
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. Berrett-Koehler Publishers, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.