@article{Hofferth2001,
author = {Hofferth, S.L. and Sandberg, J.F.},
title= {How American children spend their time},
year = {2001},
doi = {10.1111/j.1741-3737.2001.00295.x},
journal = {Journal of Marriage and Family},
volume = {63},
pages = {295--308},
}