Hughes, B. (1985). World futures: A critical analysis of alternatives. Johns Hopkins University Press.
Chicago-viite (17. p.)Hughes, Barry. World Futures: A Critical Analysis of Alternatives. Baltimore: Johns Hopkins University Press, 1985.
MLA-viite (8. p.)Hughes, Barry. World Futures: A Critical Analysis of Alternatives. Johns Hopkins University Press, 1985.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.