Sundel, M., & Sundel, S. S. (2005). Behavior change in the human services: Behavioral and cognitive principles and applications (5th ed.). Sage Publications.
Chicago-Zitierstil (17. Ausg.)Sundel, Martin, und Sandra Stone Sundel. Behavior Change in the Human Services: Behavioral and Cognitive Principles and Applications. 5th ed. Thousand Oaks, Calif: Sage Publications, 2005.
MLA-Zitierstil (9. Ausg.)Sundel, Martin, und Sandra Stone Sundel. Behavior Change in the Human Services: Behavioral and Cognitive Principles and Applications. 5th ed. Sage Publications, 2005.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.