1. Fortune Global 500,
http://fortune.com/global500/
(2017)
2. World Bank Information and Communication for Development: Extending reach and increasing impact,
http://www.worldbank.org/en/topic/ict
(2017)
3. European Commission: Digital Agenda Scoreboard,
https://ec.europa.eu/digital-single-market/en/digital-scoreboard
(2013)
4. OECD: Broadband Portal,
http://www.oecd.org/sti/broadband/broadband-statistics/
(2017)
5. AT&T: 2014 annual report.
https://www.att.com/Investor/ATT_Annual/2014/downloads/att_ar2014_annualreport.pdf
(2014)