1. Beck, U.: World at Risk. Polity, Cambridge (2007)
2. Rittel, W.J.H., Webber, M.M.: Dilemmas in a general theory of planning. Policy Sci. 4, 155–169 (1973)
3. Friend, J., Hickling, A.: Planning under Pressure: The Strategic Choice Approach, 3rd edn. Routledge, New York (2005).ISBN: 13 978-0750663731
4. Balint, J.P., Stewart, E.R., Desai, A., Walters, C.L.: Wicked Environmental Problems. Island Press, Washington, D.C. (2011).ISBN: 978-159-726-474-7
5. Stratigea, A.: Theory and Methods of Participatory Planning. Greek Academic Electronic Books, Athens (2015).ISBN: 978-960-603-241-7