Report on Spain’s Supervision of European Regulations on the Open Internet Access (Net neutrality) [documento eletrónico] : 2020 / Ministerio de Asuntos Económicos y Transformación Digital
Annual report & accounts 2019-2020 [documento eletrónico] / Office of Communications
Portugal telecom operators country intelligence report [documento eletrónico] : Global Data
Telecom services security incidents 2019 [documento eletrónico] : annual analysis report / Georgia Bafoutsou, Aggelos Koukounas, Marnix Dekker
A fidelização nos serviços de telecomunicações [documento eletrónico] / Autoridade da Concorrência
Informe de géstion consolidado 2019 [documento eletrónico] / Telefónica