Backer-Grøndahl, Agathe, and Siri Saugestad Helland. “The Psychometric Properties of the Norwegian Version of Preschool Anxiety Scale – Revised (PAS-R)”. PsykTestBarn, vol. 10, no. 1, June 2020, pp. 1-10, https://doi.org/10.21337/0068.