Kowalski, Christopher Marcin; Kwiatkowska, Katarzyna; Kwiatkowska, Maria Magdalena; Ponikiewska, Klaudia; Rogoza, Radosław; Schermer, Julie Aitken. The Dark Triad traits and intelligence: Machiavellians are bright, and narcissists and psychopaths are ordinary. Personality and Individual Differences. 2018, 135: 1–6. doi:10.1016/j.paid.2018.06.049.