@techreport{Harris2009,
author = {Harris, K.M. and Halpern, C.T. and Whitsel, E. and Hussey, J. and Tabor, J. and Entzel, P. and Udry, J.R.},
title= {The National Longitudinal Study of Adolescent to Adult Health: Research design},
year = {2009},
URL = {http://www.cpc.unc.edu/projects/addhealth/design},
}