1. Bass, B. M. (1985), ‘Leadership and performance beyond expectations’, New York: Free Press.
2. Bass, B. M. (1998), ‘Transformational leadership: Industrial, military and educational impact’,
Mahwah, NJ: Erlbaum
3. Bass, B. M., & Avolio, B. J. (1994), ‘Improving organizational effectiveness through transformational leadership’, Thousand Oaks, CA: Sage.