एपीए उद्धरण

Heller,H Robert. International trade: Theory and empirical evidence (2.). Prentice Hall of India.

शिकागो स्टाइल उद्धरण

Heller,H Robert. International Trade: Theory and Empirical Evidence. 2. New Delhi: Prentice Hall of India.

एमएलए उद्धरण

Heller,H Robert. International Trade: Theory and Empirical Evidence. 2. Prentice Hall of India.