1. Achenbach, T. M. (1991). Integrative Guide to the 1991 CBCL/4–18, YSR, and TRF Profiles. Burlington, VT: University of Vermont, Department of Psychology.
2. Achenbach, T. M. (2001). Child behavior checklist for ages 6 to 18. Burlington: University of Vermont, Research Center for Children, Youth, and Families.
3. American Psychological Association. (2007). APA Dictionary of Psychology. Washington, DC: American Psychological Association.
4. Angold, A., Costello, E. J., & Erkanli, A. (1999). Comorbidity. Journal of Child Psychology and Psychiatry, and Allied Disciplines, 40, 57–87. doi: 10.1111/1469-7610.00424 .
5. Bar-Haim, Y., Fox, N.A., Benson, B., Guyer, A.E., Williams, A., Nelson, E.E., Perez-Edgar, K., Pine, D.S., & Ernst, M. Neural correlates of reward processing in adolescents with a history of shyness and inhibited temperament. Psychological Science, in press.