As melhores marcas portuguesas 2007 / Interbrand
T-Connect : broadband service price benchmarking / ed. Teligen
IDC egovernment connection : anuário TIC para os sectores da administração pública , saúde e educação / IDC Portugal
European and US digital TV, 2006 - 2012 [documento electrónico] : boosting competitive advantage in the digital TV sector / ed. Datamonitor