@misc{Bureau of Labor Statistics2009,
author = {Bureau of Labor Statistics, U.S. Department of Labor},
title= {Labor force participation rate of women by age of youngest child, March 1975−2007},
year = {2009},
URL = {http://www.bls.gov/opub/ted/2009/jan/wk1/art04.txt},
publisher = {Washington, D.C., The Editors Desk, US Bureau of Labor Statistics},
}