Health, B. P., 2011. Mobile phone use and stress, sleep disturbances, and symptoms of depression among young adults--a prospective cohort study. [Online] Available at: https://www.ncbi.nlm.nih.gov/pubmed/21281471 [Accessed 20 April 2018].
Biography. 2000. Alexander Graham Bell Biography - Biography. [ONLINE] Available at: https://www.biography.com/people/alexander-graham-bell-9205497. [Accessed 15 April 2018].
Pew Research Center: Internet, Science & Tech. 2010. Teens and Mobile Phones | Pew Research Center. [ONLINE] Available at: http://www.pewinternet.org/2010/04/20/teens-and-mobile-phones/. [Accessed 16 April 2018].
Marketing Charts. 2008. Cell Phones Key to Teens' Social Lives, 47% Can Text with Eyes Closed - Marketing Charts. [ONLINE] Available at: https://www.marketingcharts.com/industries/media-and-entertainment-6126. [Accessed 15 April 2018].
Medical Daily. 2013. 5 Reasons Why Cellphones Are Bad For Your Health. [ONLINE] Available at: https://www.medicaldaily.com/5-reasons-why-cellphones-are-bad-your-health-247624. [Accessed 14 April 2018].
Blue Light Exposed. 2016. Blue Light Exposed. [ONLINE] Available at: http://www.bluelightexposed.com/#what-is-bue-light. [Accessed 18 April 2018].
Hacker Noon. 2017. How Much Time Do People Spend on Their Mobile Phones in 2017?. [ONLINE] Available at: https://hackernoon.com/how-much-time-do-people-spend-on-their-mobile-phones-in-2017-e5f90a0b10a6. [Accessed 15 April 2018].
US Mobile Usage: Top 5 Stats to Know. 2018. US Mobile Usage: Top 5 Stats to Know. [ONLINE] Available at: https://www.emarketer.com/corporate/coverage/be-prepared-mobile. [Accessed 19 April 2018].
Flurry Blog. 2017. U.S. Consumers Time-Spent on Mobile Crosses 5... | Flurry Blog. [ONLINE] Available at: http://flurrymobile.tumblr.com/post/157921590345/us-consumers-time-spent-on-mobile-crosses-5. [Accessed 19 April 2018].