Citazione Stile APA (7a Edizione)

Krugman, P. R., & Obstfeld, M. (1991). International economics: Theory and policy (2nd ed.). Harper Collins.

Citazione stile Chigago Style (17a edizione)

Krugman, Paul R., e Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. New York: Harper Collins, 1991.

Citatione MLA (9a ed.)

Krugman, Paul R., e Maurice Obstfeld. International Economics: Theory and Policy. 2nd ed. Harper Collins, 1991.