World radio TV handbook 2006 : the directory of global broadcasting
Portugal audiovisual / Obercom - Observatório da Comunicação
Transforming triple play [documento electrónico] : key lessons and best practices for winning RGU strategies / Guy Zibi...[et al.]
E-communications household survey [documento electrónico] / European Commission
The communications market 2006 [documento electrónico] / Office of Communications