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Schumann, Anja; Nigg, Claudio R.; Rossi, Joseph S.; Jordan, Patricia J.; Norman, Gregory J.; Garber, Carol Ewing; Riebe, Deborah; Benisovich, Sonya V. (2002). Construct Validity of the Stages of Change of Exercise Adoption for Different Intensities of Physical Activity in Four Samples of Differing Age Groups. American journal of health promotion, 16(5), pp. 280-287. Sage 10.4278/0890-1171-16.5.280
