Lawrence S. Silver, Sean Dwyer and Bruce Alford. "Learning and Performance Goal Orientation of Salespeople Revisited: The Role of Performance-Approach and Performance-Avoidance Orientations" Journal of Personal Selling and Sales Management Vol. 26 Iss. 1 (2006) p. 27 - 38
Available at: http://works.bepress.com/bruce-alford/18/