Stephenson, S. M. (2002). Non-Tariff Barriers and the Telecommunications Sector.
Chicago-Zitierstil (17. Ausg.)Stephenson, Sherry M. Non-Tariff Barriers and the Telecommunications Sector. Hamburg, 2002.
MLA-Zitierstil (8. Ausg.)Stephenson, Sherry M. Non-Tariff Barriers and the Telecommunications Sector. 2002.
警告：這些引文格式不一定是100％准確.