| − | *[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891893/ What is Extraversion For? Integrating Trait and Motivational Perspectives and Identifying the Purpose of Extraversion], Psychological Science. 2012 Dec; 23(12): 1498–1505. | + | *[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3891893/ What is Extraversion For? Integrating Trait and Motivational Perspectives and Identifying the Purpose of Extraversion], ''Psychological Science''. 2012 Dec; 23(12): 1498–1505. |