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Hellsten, Laurie-ann; Nigg, Claudio; Norman, Gregory; Burbank, Patricia; Braun, Lynne; Breger, Rosemary; Coday, Mathilda (Mace); Elliot, Diane; Garber, Carol; Greaney, Mary (Molly); Lees, Faith; Matthews, Charles; Moe, Esther; Resnick, Barbara; Riebe, Deborah; Rossi, Joseph; Toobert, Deborah; Wang, Terry (2008). Accumulation of behavioral validation evidence for physical activity stage of change. Health psychology, 27(1, Suppl), S43-S53. American Psychological Association 10.1037/0278-6133.27.1(Suppl.).S43
Padula, Cynthia A.; Rossi, Susan; Nigg, Claudio; Lees, Faith; Fey-Yensan, Nancy; Greene, Geoffrey; Clark, Phillip (2003). Using Focus Groups for Instrument Development. Journal of nutrition for the elderly, 22(4), pp. 13-33. Haworth Press 10.1300/J052v22n04_02
