1. Welcome to postnormal times;Sardar;Futures,2010
2. The Child's Construction of Reality;Piaget,1955
3. Propositional Logic. Internet Encyclopedia of Philosophy;Klement,2005
4. The evolution of consciousness as a planetary imperative: an integration of integral views;Gidley;Integral Review: A Transdisciplinary and Transcultural Journal for New Thought, Research and Praxis,2007
5. An other view of integral futures: de/reconstructing the IF brand;Gidley;Futures: The Journal of Policy, Planning and Futures Studies,2010