Lyndon E. Dawson, Jr., Barlow Soper, and Charles E. Pettijohn. The Effects of Empathy on Salesperson Effectiveness. Psychology and Marketing 9 (июль – август 1992). С. 297–310. См. также Neil M. Ford, Orville C. Walker, Jr., Gilbert A. Churchill, Jr., and Steven W. Hartley. Selecting Successful Salespeople: A Meta-Analysis of Biographical and Psychological Selection Criteria, in Annual Review of Marketing. ed. Michael J. Houston. Chicago: American Marketing Association, 1987. С. 90–131.