@book{125500,
	author = {Plomin, Robert. and DeFries, J. C.,},
	title = {Nature and nurture during infancy and early childhood /},
	publisher = {Cambridge University Press,},
	year = {1988.},
	address = {Cambridge :},
	note = {Includes indexes.},
	url = {http://www.loc.gov/catdir/description/cam023/87038222.html}
}