1. European Commission, Digital Agenda for Europe - Telecoms and the Internet.
http://ec.europa.eu/digital-agenda/en/telecoms-and-internet
2. ITU (International Telecommunication Union), Global ICT developments, 2001–2013.
http://www.itu.int/en/ITU-D/Statistics/Documents/statistics/2012/stat_page_all_charts.xls
3. Portio Research, Portio Research Mobile Factbook 2013 (2013)
4. Eurostat, Internet use in households and by individuals in 2012 (2012)
5. UNODC, Comprehensive Study on Cybercrime (2013)