Nature Versus Nurture
twins from ages 8-9 to ages 19-20. They also included the parents in the survey process. However, the Italian study was a onetime questionnaire involving only the twins between ages 23-24.
Lichtenstein, P., Tuvblad, C., Larsson, H., & Carlstrom, E. (2007) The Swedish Twin study of child and adolescent development: The TCHAD-Stduy. Twin Research & Human Genetics, 10(1), 67-73. Doi:10.1375/twin.10.1.67
McLeod, S. A. (2007). Nature Nurture in Psychology. Retrieved from http://www.simplypsychology.org/naturevsnurture.html
Picardi, A., Fagnani, C., Nistico, L., & Stazi, M. (2011) A Twin Study of Attachment Style in Young Adults. Journal Of Personality, 79(5), 965-992
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