Schmalbach, Bjarne, Markus Zenger, Ana Nanette Tibubos, Ada Borkenhagen, Bernhard Strauss, and Elmar Brähler. 2020. “The Narcissistic Personality Inventory 8: Validation of a Brief Measure of Narcissistic Personality”. International Journal of Psychological Research 13 (2):68-77. https://doi.org/10.21500/20112084.4855.