Peter, D. L. (1969). The Peter Principle: Why Things always go Wrong. Penguin.
Cita Chicago (17th ed.)Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.
Cita MLA (9th ed.)Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.