Stephenson, S. M. (2002). Non-Tariff Barriers and the Telecommunications Sector.
Lua i Stíl Chicago (17ú heag.)Stephenson, Sherry M. Non-Tariff Barriers and the Telecommunications Sector. Hamburg, 2002.
Lua MLA (8ú heag.)Stephenson, Sherry M. Non-Tariff Barriers and the Telecommunications Sector. 2002.
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