Cita APA (7th ed.)
Krugman, P. R. International Economics, 12/e. Pearson.
Cita Chicago (17th ed.)
Krugman, Paul R. International Economics, 12/e. Pearson.
Cita MLA (9th ed.)
Krugman, Paul R. International Economics, 12/e. Pearson.
Atenció: Aquestes cites poden no estar 100% correctes.