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Nigg, C. R.; Lippke, S. (2004). Health Behavior Change: How do different approaches say it happens? International journal of behavioral medicine, 11(Suppl), p. 53. Springer
Lippke, S.; Nigg, C.R.; Maddock, J.E. (2004). Testing Stage-Specific Predictions of the ToPB in the Stages of the TTM for Physical Activity. In: Keller, S.; Velicer, W. F. (eds.) Research on the Transtheoretical Model: Where are we now, where are we going? (pp. 76-78). Lengerich, Germany: Pabst Science Publishers
Lippke, S.; Nigg, C. R.; Maddock, J. E. (July 2004). Testing the Stage Assumption of the TTM in Physical Activity (Unpublished). In: American Psychological Association Conference. Honolulu, HI.
