Lua APA (7ú heag.)
Frick, D. M. (2004). Robert K. Greenleaf: A life of servant leadership. Berrett-Koehler Publishers.
Lua i Stíl Chicago (17ú heag.)
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. San Francisco, Calif.: Berrett-Koehler Publishers, 2004.
Lua MLA (9ú heag.)
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. Berrett-Koehler Publishers, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.