Wollan, R. &. O. (2013). Selling through someone else. John Wiley.
Cita Chicago (17th ed.)Wollan, Robert & Others. Selling Through Someone Else. New Jersey: John Wiley, 2013.
Cita MLA (9th ed.)Wollan, Robert & Others. Selling Through Someone Else. John Wiley, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.