Heller, H. R. (1973). International trade: Theory and empirical evidence (2d ed.). Prentice-Hall.
芝加哥风格引文Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1973.
MLA引文Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2d ed. Prentice-Hall, 1973.
警告：这些引文格式不一定是100％准确.