PETER, L. J. The Peter Principle Laurence J Peter Dan Raymond Hull. Pan Books.
Lua i Stíl Chicago (17ú heag.)PETER, Laurence J. The Peter Principle Laurence J Peter Dan Raymond Hull. Pan Books.
Lua MLA (8ú heag.)PETER, Laurence J. The Peter Principle Laurence J Peter Dan Raymond Hull. Pan Books.
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