TY - BOOK A1 - Csikszentmihalyi, M. T1 - Flow. The Psychology of Optimal Experience. New York (HarperPerennial) 1990. Y1 - 1990 UR - https://opus4.kobv.de/opus4-Fromm/frontdoor/index/index/docId/27641 N1 - Ex libris Marco Bacciagaluppi ER -