%0 Journal Article %T Trends in income-related gaps in enrollment in early childhood education: 1968 to 2013 %A Magnuson, Katherine A. %A Waldfogel, Jane %D 2016 %R 10.1177/2332858416648933 %P 1-13 %J AERA Open %V 2 %I 2 %2 ISSN: 2332-8584