1. Scenarios, the Art of Strategic Conversation;Van der Heijden,1996
2. The Sixth Sense, Accelerating Organisational Learning with Scenarios;Van der Heijden,2002
3. Bain and Company, Management Tools and Techniques, 1999
4. D. Michael. Saybrook Graduate School and Research Center, San Francisco, 1998.
5. Mind and Nature;Bateson,1979