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Badaracco Jr., J. L. (2003). How “Leading Quietly” Offers Realistic Help with the Difficult, Important Human Problems. Journal of Organizational Excellence, 22(3), 3–16. 
Badaracco Jr., J. L. (1998). The Discipline of Building Character. Harvard Business Review, 76(2), 114–124.
Colbert, A. E., Barrick, M. R., & Bradley, B. H. (2014). Personality And Leadership Composition in Top Management Teams: Implications For Organizational Effectiveness. Personnel Psychology, 67(2), 351–387
Colbert, A. E., Kristof-Brown, A. L., Bradley, B. H., & Barrick, M. R. (2008). Ceo Transformational Leadership: The Role of      Goal Importance Congruence in Top Management Teams. Academy of Management Journal, 51(1), 81–96. 
Hoch, J. E., Bommer, W. H., Dulebohn, J. H., & Wu, D. (2018). Do Ethical, Authentic, and Servant Leadership Explain Variance Above and Beyond Transformational Leadership? A Meta-Analysis. Journal of Management, 44(2), 501–529
George, B., & McLean, A. (2007). The transformation from “I” to “we.” Leader to Leader, 2007(45), 26–32.
Kotter, J. P. (2001). What Leaders Really Do. Harvard Business Review, 79(11), 85–97.
Wiseman, L., & McKeown, G. (2010). Bringing Out the Best in Your People. Harvard Business Review, 88(5), 117–121.
Wang, G., Oh, I., Courtright, S. & Colbert, A. (2011). Transformational Leadership and Performance across Criteria and Levels: A Meta-analytic Review of 25 Years of Research. Group and Organization Management 36 223-270.