@book{Tourangeau2009,
author = {Tourangeau, K. and Nord, C. and Lê, T. and Sorongon, A.G. and Najarian, M.},
title= {Early childhood longitudinal study, kindergarten class of 1998–99 (ECLS-K): Combined user’s manual for the ECLS-K eighth-grade and K-8 full sample data files and electronic codebooks (NCES 2009-004)},
year = {2009},
address = {Washington, D.C.},
publisher = {National Center for Education Statistics, US Department of Education},
}