Gaya APA

Krugman, P, R, ;, O, M, ;, M, M, J. (2012). International Economics Theory & Policy . England: Pearson Ed.Limited.

Gaya MLA

Krugman, Paul, R., ;, Obstfeld,, Maurice, ;, Melitz,, Marc, J.. "International Economics Theory & Policy". England: Pearson Ed.Limited, 2012. Text.