Eckes, A. E. (2009). U.S. trade issues: A reference handbook. ABC-CLIO.
Lua i Stíl Chicago (17ú heag.)Eckes, Alfred E. U.S. Trade Issues: A Reference Handbook. Santa Barbara, Calif.: ABC-CLIO, 2009.
Lua MLA (9ú heag.)Eckes, Alfred E. U.S. Trade Issues: A Reference Handbook. ABC-CLIO, 2009.
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