Cita APA

 Krugman, P. R. (2015).  International economics: Theory and policy.  Pearson.

Chicago Style Citation

 Krugman, Paul R.  International Economics: Theory and Policy.  Pearson, 2015.

Cita MLA

 Krugman, Paul R.  International Economics: Theory and Policy.  Pearson, 2015.

Atenció: Aquestes cites poden no estar 100% correctes.