Hukkelberg, Silje, and Torbjørn Torsheim. “Systematic Review and Classification Of: The Incredible Years (IY): Parenting Program for Preschool Children (3-6 Years) and School Children (6-12 Years) (2. Ed.)”. Ungsinn. Journal of Effective Interventions for Children and Adolescents 12, no. 2 (November 2, 2020). Accessed September 1, 2026. https://septentrio.uit.no/index.php/ungsinn/article/view/7573.