APA-čujuhus (7. p.)
Frick, D. M. (2004). Robert K. Greenleaf: A life of servant leadership. Berrett-Koehler Publishers.
Chicago-čujuhus (17. p.)
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. San Francisco, Calif.: Berrett-Koehler Publishers, 2004.
MLA-čujuhus (9. p.)
Frick, Don M. Robert K. Greenleaf: A Life of Servant Leadership. Berrett-Koehler Publishers, 2004.
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