Gaya APA

Obstfeld, M., Krugman, P, R. (1996). International economics : theory and policy / Paul R. Krugman, Maurice Obstfeld (4th ed.). New York: Addison-Wesley.

Gaya MLA

Obstfeld, Maurice.., Krugman, Paul, R.. "International economics : theory and policy / Paul R. Krugman, Maurice Obstfeld". 4th ed. New York: Addison-Wesley, 1996. Buku.