1. Scientific Method: Optimizing Applied Research Decisions;Ackoff,1962
2. Reflections on systems and their models;Ackoff;Systems Research,1996
3. Action Science: Concepts, Methods and Skills for Research and Intervention;Argyris,1982
4. The Social Construction of Reality. A Treatise in the Sociology of Knowledge;Berger,1967
5. Action research – A scientific approach?;Blum;Philosophy of Science,1955