@article{Zhang2005,
author = {Zhang, J. and Zhao, Y. and Park, A. and Song, X.},
title= {Economic returns to schooling in urban China, 1988 to 2001},
year = {2005},
doi = {10.1016/j.jce.2005.05.008},
journal = {Journal of Comparative Economics},
volume = {33},
number = {4},
pages = {730},
}