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Lua i Stíl Chicago (17ú heag.).Appleyard, Dennis R., Alfred J. .Field, agus Steven L. .Cobb. International Economics. 6th ed. Boston: McGraw-Hill Irwin, 2008.
Lua MLA (9ú heag.).Appleyard, Dennis R., et al. International Economics. 6th ed. McGraw-Hill Irwin, 2008.
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