Meningkatkan Kualitas Hidup dengan Gratitude Journal

Emmons, R. A., & Mccullough, M. E. (2004). The Psychology of gratitude. New York: Oxford University Press.

Peterson, C., & Seligman, M. E. P. (2004). Character strengths and virtues: A Handbook and classification. New York: Oxford University Press.

The WHOQOL Group. (1996). Whoqol-Bref: Introduction, administration, scoring and generic version of the assessment. Programme on Mental Health, (December), 16. https://doi.org/10.1037/t01408-000