American Psychiatric Association (2013). Diagnostic and statistical manual of mental disorders, 5th edition. Arlington, VA: American Psychiatric Publication.
Bergman, R. L., Gonzalez, A., Piacentini, J., & Keller, M. L. (2013). Integrated behavior therapy for selective mutism: A randomized controlled pilot study. Behavioral Research and Therapy, 51, 680-689.