Gaya APA

Krugman, P, R., Obstfeld, M. (2015). International economics : theory and policy (Ed.ke-10 (Ed.Global)). Yogyakarta: .

Gaya MLA

Krugman, Paul, R.., Obstfeld, Maurice. "International economics : theory and policy". Ed.ke-10 (Ed.Global) Yogyakarta: , 2015. Text.