Zettle, R. D. (2007). ACT for depression: A clinician's guide to using acceptance & commitment therapy in treating depression (1. print.). New Harbinger.
Chicago-Zitierstil (17. Ausg.)Zettle, Robert D. ACT for Depression: A Clinician's Guide to Using Acceptance & Commitment Therapy in Treating Depression. 1. print. Oakland, Calif: New Harbinger, 2007.
MLA-Zitierstil (9. Ausg.)Zettle, Robert D. ACT for Depression: A Clinician's Guide to Using Acceptance & Commitment Therapy in Treating Depression. 1. print. New Harbinger, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.