1. Alexander, R. (2000). Counseling, treatment, and intervention: Methods with juvenile and adult offenders. Brooks/Cole.
2. Alexander, R. (2010). Counseling, treatment and intervention methods with juvenile and adult offenders. Brooks/Cole.
3. American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). American Psychiatric Association.
4. Center for Deployment Psychology. (2016). Cognitive processing therapy (CPT) (pp. 1–2). Retrieved September 3, 2016, from http://deploymentpsych.org/treatments/cognitive-processing-therapy-cpt
5. Diamond, S. (2016). What is existential psychotherapy? Psychology Today, 1–2, 1–8. Retrieved September 4, 2016, from https://www.psychologytoday.com/blog/evil-deeds/20/what-is-existential-psychotherapy