Stan Moss. What Sales Executives Look for in New Salespeople, Sales & Marketing Management (март 1978). С. 43–48; Thomas Rollins, How to Tell Competent Salespeople from the Other Kind. Sales & Marketing Management (сентябрь 1990). С. 116–117, 145–146; Michael K. Rich and Daniel C. Smith. Determining Relationship Skills of Prospective Salespeople. The Journal of Business & Industrial Marketing 15 (2000). С. 242.