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Rossi, J. S.; Riebe, D.; Greaney, M. L.; Burbank, P. M.; Lees, F. D.; Garber, C. E.; Nigg, C. R. (2003). Physical activity and stages of change among community-dwelling older adults. Annals of behavioral medicine, 25, S159-S159. Springer
Nigg, C. R.; Padula, C.; Burbank, P.; Garber, C. E. (2000). What can measurement of the stage of change add to the assessment of physical activity? Gerontological Society of America Symposium: Measurement of Physical Activity in Older Adults: A Triangulation Approach. Gerontologist, 40(1), p. 325. Oxford University Press