Citazione Stile APA (7a Edizione)

Berthelon, M., & Freund, C. L. (2004). On the conservation of distance in international trade. World Bank.

Citazione stile Chigago Style (17a edizione)

Berthelon, Matias, e Caroline L. Freund. On the Conservation of Distance in International Trade. Washington, D.C: World Bank, 2004.

Citatione MLA (9a ed.)

Berthelon, Matias, e Caroline L. Freund. On the Conservation of Distance in International Trade. World Bank, 2004.