TY - BOOK A1 - Boszormenyi-Nagy, I. A1 - Spark, G. M. T1 - Invisible Loyalties. Reciprocity in Intergenerational Family Therapy. New York (Brunner/Mazel) 1984. Y1 - 1984 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/27481 N1 - Ex libris Marco Bacciagaluppi ER -