Jaak Panksepp and Margaret R. Zellner, «Towards a Neurobiologically Based Unified Theory of Aggression», Revue Internationale de Psychologie Sociale 17, no. 2 (2004): 37–61; Rebecca L. Shiner, Ann S. Masten, and Jennifer M. Roberts, «Childhood Personality Foreshadows Adult Personality and Life Outcomes Two Decades Later», Journal of Personality 71, no. 6 (2003): 1145–1170.
