@article{Elder2009,
author = {Elder, T.E. and Lubotsky, D.H.},
title= {Kindergarten entrance age and children's achievement: Impacts of state policies, family background, and peers},
year = {2009},
doi = {10.3368/jhr.44.3.641},
journal = {Journal of Human Resources},
volume = {44},
number = {3},
pages = {641--683},
}