Goodman, A; Lamping, DL; Ploubidis, GB; (2010) When to Use Broader Internalising and Externalising Subscales Instead of the Hypothesised Five Subscales on the Strengths and Difficulties Questionnaire (SDQ): Data from British Parents, Teachers and Children. Journal of abnormal child psychology, 38 (8). pp. 1179-91. ISSN 0091-0627 DOI: https://doi.org/10.1007/s10802-010-9434-x