@book{78,
	author = {Goldin, Claudia Dale.},
	title = {Understanding the gender gap :},
	publisher = {Oxford University Press,},
	year = {1990.},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0635/89033502-d.html}
}