Narcissistic Personality Disorder

Select an article or choose two to compare, that discusses the diagnosis and/or treatment of  Narcissistic Personality Disorder . Prepare a detailed response to the questions below. 

Discuss or compare and contrast each article you chose and how it demonstrates the diagnosis and/or treatment of  Disorder (for example, how is the diagnosis and/or treatment formulated?)
To what extent does/do the article(s) show the accuracy of diagnosis and/or the effectiveness of treatment for narcissistic personality disorder