 Inayatullah, Sohail. “Causal Layered Analysis. Chapter 35 in Futures Research Methodology Version 3.0. The Millennium Project, Washington, D.C.  Jackson. Michael “Foresight Glossary”  Inayatullah, Sohail. “Causal layered analysis: unveiling and transforming the future.”  Institute for Alternative Futures “Wiser Futures Workshop Compendium: Using futures tools to better understand and create the future”