1. Ala-Mutka, K., Punie, Y., & Redecke, C. (2008). Digital competence for lifelong learning. ftp://ftp.jrc.es/pub/EURdoc/EURdoc/JRC48708.TN.pdf . Accessed 03 May 2016.
2. Birol, C., Bekirogullari, Z., Etci, C., & Dagli, G. (2009). Gender and computer anxiety, motivation, self-confidence, and computer use. Eurasian Journal of Educational Research, 34, 185–198.
3. Blossfeld, H.-P. (2010). Education across the life course. In German Data Forum (Rat für Sozial- und Wirtschaftsdaten) (Ed.), Building on progress: Expanding the research infrastructure for the social, economic, and behavioral sciences (Vol. 2, pp. 825–840). Opladen: Budrich UniPress.
4. Byrne, B. M. (1996). Academic self-concept: Its structure, measurement, and relation to academic achievement. In B. A. Bracken (Ed.), Handbook of self-concept (pp. 287–316). New York: Wiley.
5. Calvani, A., Fini, A., Ranieri, M., & Picci, P. (2012). Are young generations in secondary school digitally competent? A study on Italian teenagers. Computers & Education, 58, 797–807. doi: 10.1016/j.compedu.2011.10.004 .