APA (7th ed.) Citation

Helpman, E. (1987). Imperfect competition and international trade: Evidence from fourteen industrial countries. [s.n.].

Chicago Style (17th ed.) Citation

Helpman, Elhanan. Imperfect Competition and International Trade: Evidence from Fourteen Industrial Countries. [S.l.]: [s.n.], 1987.

MLA (9th ed.) Citation

Helpman, Elhanan. Imperfect Competition and International Trade: Evidence from Fourteen Industrial Countries. [s.n.], 1987.