Cita APA (7th ed.)
Krugman, P. R., & Obstfeld, M. (1994). International economics: Theory and policy (3rd.ed.). Harper Collins.
Cita Chicago (17th ed.)
Krugman, Paul R., i Maurice Obstfeld. International Economics: Theory and Policy. 3rd.ed. Harper: Harper Collins, 1994.
Cita MLA (9th ed.)
Krugman, Paul R., i Maurice Obstfeld. International Economics: Theory and Policy. 3rd.ed. Harper Collins, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.