GUPTA SUNIL. (2009). PERSUASIVE SELLING SKILLS. IDEAS MANAGEMENT CONSULTANTS.
Cita Chicago (17th ed.)GUPTA SUNIL. PERSUASIVE SELLING SKILLS. INDIA: IDEAS MANAGEMENT CONSULTANTS, 2009.
Cita MLA (9th ed.)GUPTA SUNIL. PERSUASIVE SELLING SKILLS. IDEAS MANAGEMENT CONSULTANTS, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.