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Hausenblas, Heather A.; Nigg, Claudio R.; Downs, Danielle Symons; Fleming, David S.; Connaughton, Daniel P. (2002). Perceptions of Exercise Stages, Barrier Self-Efficacy, and Decisional Balance for Middle-Level School Students. The journal of early adolescence, 22(4), pp. 436-454. Sage 10.1177/027243102237191
