Frederick Herzberg, Bernard Mauser, and Barbara Snyderman. The Motivation to Work, 2-е изд. New York: John Wiley & Sons, 1959. См. также Robert Berl, Terry Powell, and Nicholas C. Williamson. Industrial Salesforce Satisfaction and Performance with Herzberg’s Theory. Industrial Marketing Management (февраль 1984). С. 11–19; David D. Shipley and Julia A. Kiely. Industrial Salesforce Motivation and Herzberg’s Dual Factor Theory: A U.K. Perspective. Journal of Personal Selling & Sales Management (май 1986) с. 9–16; David Hackett, Bespoke Bonus. Marketing Week 24, № 12 (2001). С. 45.