Sawyer, W. C., & Sprinkle, R. L. (2009). International economics (2rd ed.). Upper Saddle River.
Lua i Stíl Chicago (17ú heag.)Sawyer, W. Charles, agus Richard L. Sprinkle. International Economics. 2rd ed. New Jersy: Upper Saddle River, 2009.
Lua MLA (9ú heag.)Sawyer, W. Charles, agus Richard L. Sprinkle. International Economics. 2rd ed. Upper Saddle River, 2009.
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