Vekeman, G. (2008). The telecom sector in the EU. Statistics in focus: Transport.
Cita Chicago (17th ed.)Vekeman, Guy. "The Telecom Sector in the EU." Statistics in Focus: Transport 2008.
Cita MLA (8th ed.)Vekeman, Guy. "The Telecom Sector in the EU." Statistics in Focus: Transport, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.