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  1. ^ Taha, Amir; et al. (2011). "Effects of Caffeine on Vigilance Performance in Introvert and Extravert Noncoffee Drinkers". Social Behaviour and Personality. 6 (29). {{cite journal}}: |access-date= requires |url= (help); Explicit use of et al. in: |last2= (help)
  2. ^ Cetola, Hank; Prinkley, Kathleen (1986). "Intraversion-Extraversion and Loud Commercials". Psychology and Marketing. 2 (3). {{cite journal}}: |access-date= requires |url= (help)
  3. ^ Tran, Yvonne; Craig, Ashley; McIsaac, Paul (January 2004). "Extrovert or Introvert?". Australian Science. 8 (16). {{cite journal}}: |access-date= requires |url= (help)
  4. ^ R.P, Power; W.T, Thompson (1970). "Simulation of Introversion and Extraversion on the Lemon Test". British Journal of Psychology. 1 (6). {{cite journal}}: |access-date= requires |url= (help)