http://dewey.info/scheme/edition/e23/ en
616.8915 Group and family psychotherapy
616.89156 Family psychotherapy
616.891562 Marital psychotherapy
http://dewey.info/scheme/edition/e22/ de
616.8915 Gruppen- und Familientherapie
616.89156 Familientherapie
616.891562 Paartherapie
Dewey Decimal Classification
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