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Nigg, Claudio R.; Burbank, Patricia M.; Padula, Cindy; Dufresne, Robert; Rossi, Joseph S.; Velicer, Wayne F.; Laforge, Robert G.; Prochaska, James O. (1999). Stages of Change Across Ten Health Risk Behaviors for Older Adults. Gerontologist, 39(4), pp. 473-482. Oxford University Press 10.1093/geront/39.4.473