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Gaya APA
krugman, P, R., Obstfeld, M.(2004).Ekonomi Internasional Teori dan Kebijakan Edisi 5 Jilid 1 .Jakarta:Indeks.
Gaya MLA
krugman, Paul, R.., Obstfeld, Maurice."Ekonomi Internasional Teori dan Kebijakan Edisi 5 Jilid 1".Jakarta:Indeks,2004.Text.