Avolio, Bruce J., and Bernard M. Bass. "Individual Consideration Viewed at Multiple Levels of Analysis: A Multi-level Framework for Examining the Diffusion of Transformational Leadership." The Leadership Quarterly 6, no. 2 (1995): 199-218.

Bass, Bernard M., and Bruce J. Avolio. Improving organizational effectiveness through transformational Leadership. Thousand Oaks, CA: Sage, 1994.

Bass, Bernard M., and Bruce J. Avolio. "Transformational Leadership: A Response to critiques." In Psychology at Work, 300-326. London: Penguin Books, 1993.