Helpman, E., & Krugman, P. R. (1985). Market structure and foreign trade: Increasing returns, imperfect competition, and the international economy (1. publ.). Wheatsheaf Books.
Chicago-Zitierstil (17. Ausg.)Helpman, Elhanan, und Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. 1. publ. Brighton: Wheatsheaf Books, 1985.
MLA-Zitierstil (9. Ausg.)Helpman, Elhanan, und Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. 1. publ. Wheatsheaf Books, 1985.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.