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Transformational Leadership and Performance Across Criteria and Levels: A Meta-Analytic Review of 25 Years of Research 
Gang Wang, In-Sue Oh, Stephen H. Courtright, and Amy E. Colbert 
Group & Organization Management, April 2011; vol. 36, 2: pp. 223-270.

Emotional Intelligence and Transformational and Transactional Leadership: A Meta-Analysis 
P.D. Harms and Marcus Credé P.D. Harms and Marcus Credé 
Journal of Leadership & Organizational Studies 2010 17: 5

Resisting a corporate code of ethics and the reinforcement of management control 
Sven Helin and Johan Sandström 
Organization Studies May 2010 vol. 31 no. 5 583-604