Stap 4: referenties
[1] 2013. Nagel, D. verslag: Studenten gebruik van slimme telefoons en tabletten voor School, willen meer. Het Publicatieblad. http://thejournal.com/articles/2013/05/08/Report-Students-use-Smart-Phones-and-tablets-for-school-want-more.aspx#SopSTvBu5m7HDQhw.99 < accessed April 25, 2014 >[2] 2011. IBM Corporation. One-way ANOVA Post Hoc Tests. http://PIC.dhe.IBM.com/InfoCenter/spssstat/v20r0m0/index.jsp?topic=%2Fcom.IBM.SPSS.Statistics.Help%2Fidh_onew_post.htm < accessed April 25, 2014 >