Blackman ,Jeff. (2003). Stop whining start selling. John Wiley & Sons.
Cita Chicago (17th ed.)Blackman ,Jeff. Stop Whining Start Selling. John Wiley & Sons, 2003.
Cita MLA (9th ed.)Blackman ,Jeff. Stop Whining Start Selling. John Wiley & Sons, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.