@book{WatzlawickWeaklandFisch, author = {Watzlawick, Paul and Weakland, J. and Fisch, R.}, title = {Change. Principles of Problem Formation and Problem Resolution. New York (Norton) 1974.}, language = {en} } @book{WatzlawickBeavinJackson, author = {Watzlawick, Paul and Beavin, J. H. and Jackson, D. D.}, title = {Pragmatics of Human Communication. A Study of Interactional Patterns, Pathologies, and Paradoxes. New York (Norton) 1967.}, language = {en} }