Etherington, B. (2018). Selling skills for complete amateurs. Marshall Cavendish Business.
Cita Chicago (17th ed.)Etherington, Bob. Selling Skills for Complete Amateurs. Singapore: Marshall Cavendish Business, 2018.
Cita MLA (9th ed.)Etherington, Bob. Selling Skills for Complete Amateurs. Marshall Cavendish Business, 2018.
Atenció: Aquestes cites poden no estar 100% correctes.