Tepper, R. (1990). The only 250 letters and memos managers will ever need. J. Wiley.
Cita Chicago (17th ed.)Tepper, Ron. The Only 250 Letters and Memos Managers Will Ever Need. New York: J. Wiley, 1990.
Cita MLA (9th ed.)Tepper, Ron. The Only 250 Letters and Memos Managers Will Ever Need. J. Wiley, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.