APA
Krugman P. R., Obstfeld M., . (2003). International economics: Theory and policy (6th ed). New Delhi: Pearson Education.
Chicago
Krugman Paul R, Obstfeld Maurice, . 2003. International economics: Theory and policy (6th ed). New Delhi: Pearson Education.
Harvard
Krugman P. R., Obstfeld M., . (2003). International economics: Theory and policy (6th ed). New Delhi: Pearson Education.
MLA
Krugman Paul R, Obstfeld Maurice, . International economics: Theory and policy (6th ed). New Delhi: Pearson Education. 2003.