Alexandre, J L, Lange, A-M, Bilenberg, N, Gorrissen, A M, Søbye, N & Lambek, R 2018, ' The ADHD rating scale-IV preschool version : Factor structure, reliability, validity, and standardisation in a Danish community sample ', Research in Developmental Disabilities, vol. 78, pp. 125-135 . https://doi.org/10.1016/j.ridd.2018.05.006 Alexandre, J L, Lange, A M, Bilenberg, N, Gorrissen, A M, Søbye, N & Lambek, R 2018, ' The ADHD rating scale-IV preschool version : Factor structure, reliability, validity, and standardisation in a Danish community sample ', Research in Developmental Disabilities, vol. 78, pp. 125-135 . https://doi.org/10.1016/j.ridd.2018.05.006