Heilbroner, R. L. (1961). The future as history: The historic currents of our time and the direction in which they are taking America. Harper.
Chicago-Zitierstil (17. Ausg.)Heilbroner, Robert L. The Future as History: The Historic Currents of Our Time and the Direction in Which They Are Taking America. New York: Harper, 1961.
MLA-Zitierstil (9. Ausg.)Heilbroner, Robert L. The Future as History: The Historic Currents of Our Time and the Direction in Which They Are Taking America. Harper, 1961.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.