Citazione Stile APA (7a Edizione)
Helpman, E., & Krugman, P. R. (1993). Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy (5. ed.). MIT Press.
Citazione stile Chigago Style (17a edizione)
Helpman, Elhanan, e Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. 5. ed. Cambridge: MIT Press, 1993.
Citatione MLA (9a ed.)
Helpman, Elhanan, e Paul R. Krugman. Market Structure and Foreign Trade: Increasing Returns, Imperfect Competition, and the International Economy. 5. ed. MIT Press, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.