Peter, L. J. (2007). The Peter Principle. W.W. Norton & Company.
Chicago Style aipamenaPeter, Laurence J. The Peter Principle. New York: W.W. Norton & Company, 2007.
MLA aipamenaPeter, Laurence J. The Peter Principle. W.W. Norton & Company, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.