1. The developmental origins of anxiety
2. American Psychiatric Association (APA).Diagnostic and Statistical Manual of Mental Disorders (First Edition).American Psychiatric Association, Washington, DC, USA (1952).
3. American Psychiatric Association (APA).Diagnostic and Statistical Manual of Mental Disorders (Second Edition).American Psychiatric Association, Washington, DC, USA (1968).
4. American Psychiatric Association (APA).Diagnostic and Statistical Manual of Mental Disorders (Third Edition).American Psychiatric Association, Washington, DC, USA (1980).
5. American Psychiatric Association (APA).Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition).American Psychiatric Association, Washington, DC, USA (1994).