The major components of the International Futures (IFs) modeling system are extensively documented in working papers, and documentation of any given component is updated at intervals to reflect additions and refinements as well as connections to other system components. Because of its evolving nature, it is important to note working paper numbers and dates when using and citing model documentation.
Full Citation: Hughes, B. B. (1988). International futures (IFs): History and status. Social Science Computer Review, 6(1), 43–48. http://ssc.sagepub.com/content/6/1/43.full.pdf+html
Hughes, Barry B. International Futures: Choices in the Creation of a New World Order. 2. ed. Dilemmas in World Politics. Boulder, Colo.: Westview Press, 1996.