APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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