Nansook park, Christopher Peterson, Martin E. P. Seligman. (2004). Strengths of character and well-being. Journal of Social and Clinical Psychology, 23(5), 603-619.
Laci Canion. (2004). Your Employees Are a Reflection of You: The Power of the Self-Fulfilling Prophecy. E-Journal of Organizational Learning and Leadership, 3(2).