1. Typological Survey of Futures Research in the U.S.;McHale,1970
2. Typological Survey of Futures Research in the U.S.;McHale,1970
3. The Institute for the Future: Its Evolving Role;Amara;The Futurist,1973
4. Webster's Seventh New Collegiate Dictionary,1966
5. Typological Survey of Futures Research in the U.S.;McHale,1970