1. Transformational leadership, charisma, and beyond;Avolio,1988
2. Task roles and social roles in problem-solving groups;Bales,1958
3. Evolving perspectives on charismatic leadership;Bass,1988
4. Leadership and performance: Beyond expectations;Bass,1985
5. Management styles associated with organizational, task, personal and interpersonal contingencies;Bass;Journal of Applied Psychology,1975