Anuário de media & publicidade 2007 / ed. Marktest
Estudo europeu sobre a satisfação com os serviços de telecomunicações 2008 [documento electrónico] / Paulo Paula, João Marques
The international communications market 2008 [documento electrónico] / Office of Communications
EN 60728-1 [documento electrónico] : cable networks for television signals, sound signals and interactive services: part 1: system performance of forward paths: (IEC 60728-1:2007) / European Committee for Electrotechnical Standardization
Global entertainment and media outlook : 2008-2012 / Wilkofsky Gruen Associates, Inc.