@book{Snow2009,
author = {Snow, K. and A., Derecho and Wheeless, S. and Lennon, J. and Rosen, J. and Rogers, J. and Kinsey, S. and Morgan, K. and Einaudi, P. },
title= {Early Childhood Longitudinal Study, Birth cohort (ECLS-B), kindergarten 2006 and 2007 data file user’s manual (2010-010)},
year = {2009},
address = {Washington, DC},
publisher = {National Center for Education Statistics, Institute of Education Sciences, US Department of Education},
}