Heilbroner, R. L. (1968). The economic problem. New York: Prentice-Hall.
Trích dẫn kiểu ChicagoHeilbroner, Robert L. The Economic Problem. New York: Prentice-Hall, 1968.
MLA引文Heilbroner, Robert L. The Economic Problem. New York: Prentice-Hall, 1968.
警告：这些引文格式不一定是100％准确.