APA Citation

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

Trích dẫn kiểu Chicago

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

MLA Citation

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

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