Antoñanzas, José Luís, Ester Ayllón Negrillo, Nieves Moyano, and Jacobo Cano. “School Factors Associated With Perpetrators and Victims of Direct and Indirect Bullying Among Adolescents”. Universitas Psychologica 21 (February 3, 2022). Accessed August 22, 2025. https://revistas.javeriana.edu.co/index.php/revPsycho/article/view/1-14.