Kilburn, M. R. & Karoly, L. A. (2008). What does economics tell us about early childhood? RAND Corporation research brief series. Retrieved as pdf 10/24/08 from www.rand.org/pubs/research_briefs/RB9352/
The science of early childhood development: Closing the gap betiveen what we know and what we do. (2007). Executive Summary. The National Scientific Council on the Developing Child, Retrieved 10/24/08 from www.developingdiild.net/pubs/pubs.html
JOURNAL OF PRENATAL AND PERINATAL PSYCHOLOGY AND HEALTH publishes research and clinical articles from the cutting edge of the science of prenatal and perinatal psychology and health. The journal, published quarterly since 1986, is dedicated to the in-depth exploration human reproduction and pregnancy and the mental and emotional development of the unborn and newborn child.