1. Ansari, M. (1990).Managing people at work: Leadership styles and influence strategies. Beverly Hills: Sage.
2. Avolio, B., & Bass, B. (1988). Transformational leadership, charisma and beyond. In J. G. Hunt, B. R. Baliga, H. P. Dachler, & C. A. Schriesheim (Eds.),Emerging leadership vistas (pp. 29–50). Lexington, MA: Lexington Books.
3. Avolio, B., & Yammarino, F. (1990). Operationalizing charismatic leadership using a levels of analysis framework.Leadership Quarterly, 1, 3, 193–209.
4. Avolio, B., Yammarino, F., & Bass, B. (1991). Identifying common methods variance with data collected from a single source: An unresolved sticky issue.Journal of Management, 17, 3, 571–587.
5. Bass, B. (1985).Leadership and performance beyond expectations. New York: Free Press.