Gaya APA

Krugman, P, R., Obstfeld, M. (2003). International economics thepry and policy ed. 3 (3). Boston: Addison-wesley Publishing Company.

Gaya MLA

Krugman, Paul, R., Obstfeld, Maurice. "International economics thepry and policy ed. 3". 3 Boston: Addison-wesley Publishing Company, 2003. Text.