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.
United States National Intelligence Council (US NIC). 2004. Mapping the Global Future: Report of the National Intelligence Council’s 2020 Project. Washington, DC: United States National Intelligence Council.
Hughes, Barry B. 2004. "The Base Case of International Futures (IFs): Comparison with Other Forecasts." Working papers 2004.04.17. Pardee Center for International Futures, Josef Korbel School of International Studies, University of Denver, Denver, CO.