APA استشهاد

Heller, H. R. (1973). International trade: Theory and empirical evidence (2nd ed.). Prentice-Hall of India.

استشهاد بنمط شيكاغو

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2nd ed. New Jersey: Prentice-Hall of India, 1973.

MLA استشهاد

Heller, H. Robert. International Trade: Theory and Empirical Evidence. 2nd ed. Prentice-Hall of India, 1973.