@inbook{Heckman1999,
author = {Heckman, J. and Lalonde, R. and Smith, J.},
title= {The economics and econometrics of active labor market programs},
year = {1999},
doi = {10.1016/S1573-4463(99)03012-6},
editor = {Ashenfelter, O.},
editor = {Card, D.},
booktitle = {Handbook of Labor Economics},
address = {Amsterdam},
publisher = {Elsevier},
pages = {1865--2097},
}