TY - BOOK A1 - Watzlawick, Paul A1 - Weakland, J. A1 - Fisch, R. T1 - Change. Principles of Problem Formation and Problem Resolution. New York (Norton) 1974. Y1 - 1974 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/29058 N1 - Ex libris Marco Bacciagaluppi ER -