Cita APA (7a ed.)

Heller, H. R. (1968). International trade theory and empirical evidence. Prentic- Hall.

Cita Chicago Style (17a ed.)

Heller, H. Robert. International Trade Theory and Empirical Evidence. NewJersey: Prentic- Hall, 1968.

Cita MLA (9a ed.)

Heller, H. Robert. International Trade Theory and Empirical Evidence. Prentic- Hall, 1968.