APA-referens (7:e uppl.)
Heilbroner, R. L. (1996). Visions of the future: The distant past, yesterday, today, tomorrow. New York Public Library : Oxford University Press.
Chicago-referens (17:e uppl.)
Heilbroner, Robert L. Visions of the Future: The Distant Past, Yesterday, Today, Tomorrow. New York: New York Public Library : Oxford University Press, 1996.
MLA-referens (9:e uppl.)
Heilbroner, Robert L. Visions of the Future: The Distant Past, Yesterday, Today, Tomorrow. New York Public Library : Oxford University Press, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.