एपीए उद्धरण

Heller, H. (1977). International trade theory and empirical evidence/2nd ed. Prentice hall.

शिकागो स्टाइल उद्धरण

Heller, H.Robert. International Trade Theory and Empirical Evidence/2nd Ed. New Delhi: Prentice hall, 1977.

एमएलए उद्धरण

Heller, H.Robert. International Trade Theory and Empirical Evidence/2nd Ed. Prentice hall, 1977.