1. Achenbach, T. (1991). Manual for the child behavior checklist/ 4–18 and 1991 profile. Burlington, VT: University of Vermont Department of Psychiatry.
2. Angold, A., & Costello, E. J. (2000). The child and adolescent psychiatric assessment (CAPA). Journal of the American Academy of Child and Adolescent Psychiatry, 39, 39–48.
3. Angold, A., Costello, E. J., & Erkanli, A. (1999). Comorbidity. Journal of Child Psychology and Psychiatry, 40, 57–87.
4. Angold, A., Costello, E. J., Farmer, E. M., Burns, B. J., & Erkanli, A. (1999). Impaired but undiagnosed. Journal of the American Academy of Child Adolescent Psychiatry, 38, 129–137.
5. Angold, A., Costello, E. J., Messer, S. C., Pickles, A., Winder, F., & Silver, D. (1995). Development of a short questionnaire for use in epidemiological studies of depression in children and adolescents. International Journal of Methods in Psychiatric Research, 5, 237–249.