Hannaford, J., & Heilbroner, R. L. (1972). A programmed guide to The economic problem, third edition [by] Robert L. Heilbroner. Prentice-Hall.
芝加哥风格引文Hannaford, John, 与 Robert L. Heilbroner. A Programmed Guide to The Economic Problem, Third Edition [by] Robert L. Heilbroner. Englewood Cliffs, N.J.: Prentice-Hall, 1972.
MLA引文Hannaford, John, 与 Robert L. Heilbroner. A Programmed Guide to The Economic Problem, Third Edition [by] Robert L. Heilbroner. Prentice-Hall, 1972.
警告：这些引文格式不一定是100％准确.