KRUGMAN, P. R. (2012). International economics: Theory & policy ninth edition. Pearson Education Limited.
Chicago-viite (17. p.)KRUGMAN, Paul R. International Economics: Theory & Policy Ninth Edition. Pearson Education Limited, 2012.
MLA-viite (8. p.)KRUGMAN, Paul R. International Economics: Theory & Policy Ninth Edition. Pearson Education Limited, 2012.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.