O sector das comunicações 2021 [documento eletrónico] / Autoridade Nacional de Comunicações
Mobile and fixed broadband prices in Europe 2021 [documento eletrónico] / European Commission
Main developments in the postal sector (2017-2021) [documento eletrónico] / Mindaugas Cerpickis...[et al.]
Annual Monitoring Update for Postal Services [documento eletrónico] : Financial year 2021-22 / Office of Communications
Telecomunicaciones y audiovisual informe económico sectorial [documento electrónico] : 2021 / Comisión Nacional de los Mercados y la Competencia