Citazione Stile APA (7a Edizione)

HELLER H ROBERT. (1988). INTERNATIONAL TRADE: THEORY AND EMPRICAL EVIDENCE (2.). PRENTICE -HALL INTERNATIONAL, INC.

Citazione stile Chigago Style (17a edizione)

HELLER H ROBERT. INTERNATIONAL TRADE: THEORY AND EMPRICAL EVIDENCE. 2. NEW DELHI: PRENTICE -HALL INTERNATIONAL, INC, 1988.

Citatione MLA (9a ed.)

HELLER H ROBERT. INTERNATIONAL TRADE: THEORY AND EMPRICAL EVIDENCE. 2. PRENTICE -HALL INTERNATIONAL, INC, 1988.