Παραπομπή APA

Martin Sundel & Sandra S. Sundel. (2018). Behavior change in the human services: Behavioral and cognitive principles and applications (Sixth edition.). Sage Publications.

Παραπομπή Chicago Style

Martin Sundel και Sandra S. Sundel. Behavior Change in the Human Services: Behavioral and Cognitive Principles and Applications. Sixth edition. London: Sage Publications, 2018.

Παραπομπή MLA

Martin Sundel και Sandra S. Sundel. Behavior Change in the Human Services: Behavioral and Cognitive Principles and Applications. Sixth edition. Sage Publications, 2018.