How does parents, work and child development interchange?
These sites have a lot of information about this subject.
http://www.essortment.com/all/workingparents_pio.htm
http://www.businessweek.com/careers/workingparents/blog/archives/2006/10/new_study_its_t_1.html
http://www.childcareaware.org/en/subscriptions/dailyparent/