Barrios, Á., Dios, M. J. d., Barrio, C. d., Gutiérrez, H., & Montero, I. (2008). The incidence of peer bullying as multiple maltreatment among Spanish secondary school students. International Journal of Psychology and Psychological Therapy.

Barrios, Ángela, Ma José de Dios, Cristina del Barrio, Héctor Gutiérrez, ja Ignacio Montero. "The Incidence of Peer Bullying As Multiple Maltreatment among Spanish Secondary School Students." International Journal of Psychology and Psychological Therapy 2008.

Barrios, Ángela, et al. "The Incidence of Peer Bullying As Multiple Maltreatment among Spanish Secondary School Students." International Journal of Psychology and Psychological Therapy 2008.