Παραπομπή σε μορφή APA (7η εκδ.)

Heilbroner, R. L. (1960). The future as history: The historic currents of our time and the direction in which they are taking America. Harper & Row Publisher.

Παραπομπή σε μορφή Chicago (17η εκδ.)

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 & Row Publisher, 1960.

Παραπομπή σε μορφή MLA (9th εκδ.)

Heilbroner, Robert L. The Future as History: The Historic Currents of Our Time and the Direction in Which They Are Taking America. Harper & Row Publisher, 1960.