US National Library of Medicine
Medline Plus: Narcissistic Personality Disorder
Medline Plus, a government service from the U.S. National Library of Medicine and National Institutes of Health presents a brief overview of narcissistic personality disorder.
New York Times
New York Times: Health Guide: Narcissistic Personality Disorder
[Free Registration/Login Required] One-page summary of the causes, symptoms, and treatment of narcissistic personality disorder.