1. Arkin, H. and Colton, R.R. (1963) Tables for Statisticians, New York: Barnes & Noble.
2. Bartlett-Bragg, A. (2006) Reflections on pedagogy: Reframing practice to foster informal learning with social software, http://matchsz.inf.elte.hu/TT/docs/Anne20Bartlett-Bragg.pdf , accessed 10 February 2008.
3. Boyd, D.M. and Ellison, N.B. (2008) Social network sites: Definition, history, and scholarship. Journal of Computer-Mediated Communication 13 (1): 210–230.
4. Breslauer, B. and Smith, T. (2009) Social media trends around the world! The global web index (GWI). ESOMAR Research, Online Research, Chicago, IL.
5. Bughin, J., Chui, M. and Miller, A. (2009) How companies are benefiting from web 2.0: Mckinsey Global Survey Results. McKinsey Quarterly 17 (6): 1–9.