APA-viite (7. p.)
Krugman, P. R., & Obstfeld, . M. (2003). International economics: Theory and policy (Sixth ,ed.). Addison Wesley.
Chicago-viite (17. p.)
Krugman, Paul R., ja Maurice Obstfeld. International Economics: Theory and Policy. Sixth ,ed. Boston San Francisco New York: Addison Wesley, 2003.
MLA-viite (9. p.)
Krugman, Paul R., ja Maurice Obstfeld. International Economics: Theory and Policy. Sixth ,ed. Addison Wesley, 2003.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.