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Frick, Paul J.; White, Stuart F. (21 de janeiro de 2008). «Research Review: The importance of callous-unemotional traits for developmental models of aggressive and antisocial behavior». Journal of Child Psychology and Psychiatry (em inglês). 49 (4): 359–375. ISSN0021-9630. PMID18221345. doi:10.1111/j.1469-7610.2007.01862.x