Jung D I, Avolio B J. Opening the black box: an experimental investigation of the mediating effects of trust and value congruence on transformational and transactional leadership. Journal of Organizational Behavior, 2000, (9): 949- 964.

Pillai R, Schriesheim C A, Williams E S. Fairness Perceptions and Trust as Mediators for Transformational and Transactional Leadership: A Two- Sample Study. Journal of Management , 1999, ( 6 ): 8 97- 9 33 .