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Armstrong, C. A., Sallis, J. F., Hovell, M. F., & Hofstetter, C. (1993). Stages of Change, Self-Efficacy, and the Adoption of Vigorous Exercise: A Prospective Analysis, Journal of Sport and Exercise Psychology, 15(4), 390-402. Retrieved Nov 17, 2019, from https://journals.humankinetics.com/view/journals/jsep/15/4/article-p390.xml