Persistent Depressive Disorder: References

Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Washington, D.C.: American Psychiatric Association; 2013.

National Institutes of Health. Depression: What you need to know. National Institute of Mental Health. http://www.nimh.nih.gov/health/publications/depression-what-you-need-to-know-12-2015/index.shtml. 2015. Accessed July 2016.

Devanand D. Dysthymic disorder in the elderly population. Int Psychogeriatr. 2013:1-10. doi:10.1017/s104161021300166x.