 | Up a level |
Schumann, A; Estabrooks, P A; Nigg, C R; Hill, J (2003). Validation of the Stages of Change with Mild, Moderate, and Strenuous Physical Activity Behavior, Intentions, and Self-efficacy. International journal of sports medicine, 24(5), pp. 363-365. Thieme 10.1055/s-2003-40706
