Cita APA (7th ed.)
Heilbroner, R. L. (1996). Visions of the future: The distant past, yesterday, today, tomorrow. New York Public Library : Oxford University Press.
Cita Chicago (17th ed.)
Heilbroner, Robert L. Visions of the Future: The Distant Past, Yesterday, Today, Tomorrow. New York: New York Public Library : Oxford University Press, 1996.
Cita MLA (9th ed.)
Heilbroner, Robert L. Visions of the Future: The Distant Past, Yesterday, Today, Tomorrow. New York Public Library : Oxford University Press, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.