Electronic/World Wide Web>Internet Article:  Sadedin, Suzanne (Nov 7, 2016), Why do women have periods? What is the evolutionary benefit or purpose of having periods? Why can’t women just get pregnant without the menstrual cycle?, Retrieved on 2018-03-20

Source Material [www.quora.com]

Electronic/World Wide Web>Internet Article:  Sadedin, Suzanne (8/4/2014), War in the womb, Retrieved on 2014-08-08

Source Material [aeon.co]

Books, Brochures, and Chapters>Book:  Medina , John (2010-10-12), Brain Rules for Baby: How to Raise a Smart and Happy Child from Zero to Five, Pear Press, Retrieved on 2011-07-27

Books, Brochures, and Chapters>Book:  Gopnik , Meltzoff , Kuhl (2001-01-01), The Scientist in the Crib: What Early Learning Tells Us About the Mind, Harper Paperbacks, Retrieved on 2011-07-06

Books, Brochures, and Chapters>Book:  Small , Meredith (1999-05-04), Our Babies, Ourselves: How Biology and Culture Shape the Way We Parent, Anchor, Retrieved on 2011-06-29

Books, Brochures, and Chapters>Book:  Brott , Armin A. and Ash , Jennifer (2010-09-28), The Expectant Father: Facts, Tips, and Advice for Dads-to-Be (New Father Series), Abbeville Press, Retrieved on 2011-06-29

Books, Brochures, and Chapters>Book:  Bradley , Hathaway , Hathaway , Hathaway (2008-05-20), Husband-Coached Childbirth (Fifth Edition): The Bradley Method of Natural Childbirth, Bantam, Retrieved on 2011-05-21

Books, Brochures, and Chapters>Book:  Paul , Annie Murphy (2010-09-28), Origins: How the Nine Months Before Birth Shape the Rest of Our Lives, Free Press, Retrieved on 2011-02-08