1. Cisco visual networking index: forecast and methodology, 2015-2020;Forecast Methodol.,2015
2. Grand View Research. (2017). Over-the-Top (OTT) Devices And Services Market Analysis By Content (VoIP, Text & Images, Video), By Revenue Source (AVOD, SVOD, TVOD), By Device (Mobile Devices & Computers, Gaming Console, Smart TVs & STB), By Deployment, And Segment Forecasts, 2018 - 20. Retrieved from https://www.grandviewresearch.com/industry-analysis/over-the-top-ott-devices-services-market.
3. Eurostat. (2017 a). Individuals - internet activities. Retrieved February 3, 2018, from http://appsso.eurostat.ec.europa.eu/nui/submitViewTableAction.do.
4. Understanding continued information technology usage behavior: a comparison of three models in the context of mobile internet;Hong;Decision Support Systems,2006
5. E - Loyalty: Your Secret Weapon on the Web;Reicheld;Harv. Bus. Rev.,2000