Cita APA (7a ed.)

Heller, H. R. (1968). International trade: Theory and empirical evidence (1st edition.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 1st edition. Englewood Cliffs, New Jersey: Prentice-Hall, 1968.

Cita MLA (8a ed.)

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 1st edition. Prentice-Hall, 1968.