http://dewey.info/scheme/edition/e23/ en
616.8915 Group and family psychotherapy
616.89152 Group psychotherapy
616.891523 Psychodrama
http://dewey.info/scheme/edition/e22/ de
616.8915 Gruppen- und Familientherapie
616.89152 Gruppentherapie
616.891523 Psychodrama
Dewey Decimal Classification
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