How Twins Work

Lots More Information

These are some sources that we found useful in researching this article:

Books

Stedman's Medical Dictionary, 27th edition
The Concise Science Encyclopedia, Kingfisher Publications
Entwined Lives: Twins and what they tell us about human behavior by Nancy L. Segal, Ph.D.
Twins and What They Tell Us About Who We Are by Lawrence Wright
Twins: An Uncanny Relationship by Peter Watson
Twins! Pregnancy, Birth and the First Year of Life by Connie Agnew, M.D., Alan Klein, M.D. and Jill Alison Ganon
The Art of Parenting Twins by Patricia Maxwell Malmstrom and Janet Poland

Articles, Journals and Periodicals

National Vital Statistics Reports
"Fetus In Fetu: A Case Report" by SV Phatak, PK Kolwadkar, MS Phatak: Ind J Radiol Imag 2003 13:1:93-94
"Larger Women More Likely to Have Twins" by Emma Baines, GP: Obstet Gynecol 2005
"Twin Language: A Risk Factor for Language Impairment?" by D.V.M. Bishop, S.J. Bishop: Journal of Speech, Language & Hearing Research, February 1998, Vol. 41, Issue 1

Web References

CBS News, 48 Hours http://www.cbsnews.com
Internet Movie Database http://www.imdb.com
The Twin to Twin Transfusion Syndrome Foundation Inc.www.tttsfoundation.org
The Minnesota Twin Family Study http://www.psych.umn.edu/psylabs/mtfs/default.htm