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"Study of Identical Twins Separated at Birth and Reunited Later in Life." Apr. 17, 2003. <http://www.modcult.brown.edu/students/angell/twinstudy.html>
Nature vs. Nurture
Helm, Heather. "Studies Dealing With Twins." Apr. 17, 2003. <http://www.ux1.eiu.edu/~cxtdm/twins.html>
Nature vs. Nurture
Torgersen, S., Onstad, S., & Skre, I. (1993). "True" schizotypal personality disorder: A study of co-twins and relatives of schizophrenic probands. American Journal of Psychiatry, 150, 1661-1667.
Bipolar Disorder and Twins
Staver, Matthew. Separation of Church and State. Liberty Counsel. http://www.lc.org/OldResources/separation.html
The Separation of Church and State
Shields, M. Monozygotic Twins Brought Up Apart and Brought Up Together. London: Oxford Univ. Press. 1962.
Happiness and Genetics
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