Kornør, Hege, and Sonja Heyerdahl. “The Psychometric Properties of the Norwegian Version of Strengths and Difficulties Questionnaire, Teacher Report (SDQ-T)”. PsykTestBarn 4, no. 2 (October 15, 2014): 1–15. Accessed August 27, 2026. https://septentrio.uit.no/index.php/psyktestbarn/article/view/7501.