H. J. Eysenck, Readings in Extraversion and Introversion: Bearings on Basic Psychological Processes (New York: Staples Press, 1971).
75
Grant, “Rethinking the Extraverted Sales Ideal.”
76
Ibid.
77
Steve W. Martin, “Seven Personality Traits of Top Salespeople,” HBR Blog Network, June 27, 2011, доступно на ; Lynette J. Ryals and Iain Davies, “Do You Really Know Who Your Best Salespeople Are?” Harvard Business Review, December 2010.