Individuals with narcissistic personality disorder often practice the defense mechanism of denialism.<ref>[https://guilfordjournals.com/doi/abs/10.1521/psyc.2013.76.1.32 Defense Mechanisms in Schizotypal, Borderline, Antisocial, and Narcissistic Personality Disorders]<ref>
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Individuals with [[narcissistic personality disorder]] often practice the defense mechanism of denialism.<ref>[https://guilfordjournals.com/doi/abs/10.1521/psyc.2013.76.1.32 Defense Mechanisms in Schizotypal, Borderline, Antisocial, and Narcissistic Personality Disorders]</ref>