Stuntz, Cheryl P. “Linking Positive Psychology and the Transtheoretical Model: How Character Strengths and Processes of Change Relate to Each Other and to Exercise”. Journal of Positive Psychology and Wellbeing 1, no. 2 (October 2, 2017): | 85-108 |. Accessed November 17, 2019. http://journalppw.com/index.php/JPPW/article/view/13.