The Sidran Institute is a nonprofit dedicated to assisting people with post-traumatic stress disorder, dissociative disorders, and other trauma-related conditions. They provide information for those living with PTSD and DID, professionals assisting them, and those who want to start self-help groups.
Hope for Healing.org: Dissociative Identity Disorder (MPD)
Collection of information and resources on dissociative identity disorder/multiple personality disorder, published on HopeforHealing.org. Includes self-help resources.
Mental Health America Fact Sheet: Dissociation and Dissociative Disorders
The International Society for the Study of Trauma and Dissociation
"ISSTD seeks to advance clinical, scientific, and societal understanding about the prevalence and consequences of chronic trauma and dissociation."
Visit the FAQ (http://www.isst-d.org/default.asp?contentID=76) for useful information on dissociation and dissociative disorders.
Dissociative Disorders: Information from the Mayo Clinic
Description of dissociative disorders, including symptoms, causes, risk factors, tests, treatment, and more.
http://www.mayoclinic.com/health/dissociative-disorders/DS00574