Referensi
- Emmons, R. A. (2004). The psychology of gratitude: An introduction. In Emmons, R. A., & McCullough, M. E. (Eds).The Psychology of Gratitude. New York: Oxford University Press.
- Park, N., Peterson, C., & Seligman, M. E. P. (2004). Strengths of character and wellbeing. Journal of Social and Clinical Psychology, 23(5), 603-619.
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