Naruskov, K., & Luik, P. (2015). The perception of the cyberbullying phenomenon among Estonian students: Comparison of boys and girls on the basis of cyberbullying criteria and types of behaviour. Eesti Haridusteaduste Ajakiri. Estonian Journal of Education, 3(2), 186–215. https://doi.org/10.12697/eha.2015.3.2.07