@article{Gangl2009,
author = {Gangl, M. and Ziefle, A.},
title= {Motherhood, labor force behavior, and women’s careers: An empirical assessment of the wage penalty for motherhood in Britain, Germany and the United States},
year = {2009},
doi = {10.1353/dem.0.0056},
journal = {Demography},
volume = {46},
number = {2},
pages = {341--369},
}