APA, 1994 Diagnostic and statistical manual of mental disorders PTSD Posttraumatic Stress Disorder post-traumatic stress disorder now is classified as an associated feature criteria post-traumatic stress disorder Diagnostic and Statistical Manual of Mental Disorders PTSD post-traumatic stress disorder APA, 1994 Diagnostic and statistical manual of mental disorders Diagnostic and statistical manual of mental disorders PTSD APA, 1994 officially recognized as an experience that can trigger PTSD PTSD APA, 1994 Diagnostic and statistical manual of mental disorders Diagnostic and Statistical Manual of Mental Disorders DSM-III-R (American Psychiatric Association, 1987)