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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
The Tragedy of Pudd'nhead Wilson and the Comedy of Those Extraordinary Twins, November 28, 1894
Mark Twain
Tully, L, and L. Arseneault (2004). Does maternal Warmth Moderate the Effects of Birth Weight on Twins' ADHD Symptoms and Low IQ? Journal of Consulting and Clinical Psychiatry.
Effect of Low Birth Weight on Intelligence
Whitam, F,L, Diamond, M. and Martin, J. 1993. Homosexual orientation in twins: a report on 61 pairs and three triplet sets. Arch Sex Behav., 22(3), 187-206.
Sexual Orientation
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