Tofauti kati ya marekesbisho "Mapacha"

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* {{Cite journal|vauthors=Lummaa V, Pettay JE, Russell AF |title=Male twins reduce fitness of female co-twins in humans |journal=Proceedings of the National Academy of Sciences of the United States of America |volume=104 |issue=26 |pages=10915–20 |date=June 2007 |pmid=17576931 |pmc=1904168 |doi=10.1073/pnas.0605875104 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=17576931 |accessdate=2008-10-06}}
* {{Cite book|first=Elyse |last=Schein |author2=Paula Bernstein |title=Identical Strangers: A Memoir of Twins Separated and Reunited |publisher=Random House |location=New York |year=2007 |pages= |isbn=1-4000-6496-1 |oclc=123390922}}
* {{Cite journal|last=Helle |first=Samuli |author2=Virpi Lummaa |author3=Jukka Jokela |year=2004 |title=Selection for Increased Brood Size in Historical Human Populations |journal=Evolution |volume=58 |pages=430–436 |doi=10.1111/j.0014-3820.2004.tb01658.x |url=http://www.huli.group.shef.ac.uk/helleevolution2004.pdf |format=PDF|accessdate=2008-10-02 |pmid=15068359 |issue=2}}{{dead link|date=February 2017}}
* {{cite web|year=2008 |title=TWINS Guide to the First Year |publisher=TWINS Magazine |location=[[Fort Collins, Colorado]] |url=http://www.twinsmagazine.com/media/images/Guide2008.pdf |format=PDF|accessdate=2008-10-06}}{{dead link|date=February 2017}}
* {{cite web|url=http://www3.telus.net/tyee/multiples/index.html |title=Facts About Multiples: An Encyclopedia of Multiple Birth Records |accessdate=2008-10-18 |first=Jennifer |last=Samson}}{{dead link|date=February 2017}}
* Am J Med Genet C Semin Med Genet. 2009 May 15;151C(2):136-41. Not really identical: epigenetic differences in monozygotic twins and implications for twin studies in psychiatry. Haque FN, Gottesman II, Wong AH.