James O. Prochaska, Wayne F. Velicer, Joseph S. Rossi, Michael G. Goldstein, Bess H. Marcus, William Rakowski, Christine Fiore, Lisa L. Harlow, Colleen A. Redding, Dena Rosenbloom, Susan R. Rossi,
Stages of change and decisional balance for 12 problem behaviors Health Psychology. ,vol. 13, pp. 39- 46 ,(1994) ,
10.1037/0278-6133.13.1.39