 Barbieri Masini, Eleonora. “Why future studies”  Miklos Tomas and Ma. Elena Tello. “Foresight planning.”  Foresight Education and Research Network. http://www.globalforesight.org/glossary  Bell, Wendell, “Foundations of Future Studies, Vol 1 and Vol 2, Transaction Publishers, New Brunswick and New York, 1997, ISBN 1-56000-81-6