1. Baumer, E., Adams, P., Khovanskaya, V., Liao, T., Smith, M., Schwanda Sosik, V. and Williams, K. 2013. Limiting, Leaving and (re)Lapsing: An Exploration of Facebook Non-Use Practices and Experiences. InProc. CHI '13,, 3257--3266, ACM.
2. Berg Insight. 2014.Shipments of connected wearables will reach 168 million in 2019. Berg Insight. Retrieved from: http://www.berginsight.com/News.aspx.
3. Braun, V. and Clarke, V. 2006. Using thematic analysis in psychology.Qualitative research in psychology, 3(2), 77--101.
4. Cancer Prevention Research Center.Exercise: Stages of Change - Short Form. Retrieved from: http://www.uri.edu/research/cprc/Measures/Exercise02.htm
5. Case M. A., Burwick H. A., Volpp K. G. and Patel M. S. 2015. Accuracy of Smartphone Applications and Wearable Devices for Tracking Physical Activity Data.JAMA. 313(6), 625--626.