APA (7e ed.) Bronvermelding

Heller, H. R. (1973). International trade: Theory and empirical evidence (2d ed.). Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1973.

MLA (8e ed.) Bronvermelding

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2d ed. Prentice-Hall, 1973.