1. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.
2. American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (4th TR-ed.). Washington, DC: Author.
3. Azmitia, M. (2001). Self, self-Esteem, conflicts, and best friendships in early adolescence. In T. M. Brinthaupt & R. P. Lipka (Eds.), Understanding the self of the early adolescent Albany, NY: SUNY Press.
4. Asher, S. R., Parker, J. G., & Walker, D. L. (1996). Distinguishing friendship from acceptance: Implications for intervention and assessment. In W. M. Bukowski, A. F. Newcomb, & W. W. Hartup (Eds.), The company they keep: Friendships in childhood and adolescence (pp. 366–406). Cambridge: Cambridge University Press.
5. Bauminger, N., & Kasari, C. (2000). Loneliness and friendship in high-functioning children with autism. Child Development, 71, 447–456.