Machimbarrena, J. M., and M. Garaigordobil. “Bullying/Cyberbullying in 5th and 6th Grade: Differences Between Public and Private Schools”. Anales De Psicología / Annals of Psychology, Vol. 33, no. 2, Mar. 2017, pp. 319-26, doi:10.6018/analesps.33.2.249381.