Peter, D. L. (1969). The Peter Principle: Why Things always go Wrong. Penguin.
Chicago-čujuhus (17. p.)Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.
MLA-čujuhus (9. p.)Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.
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