TY - JOUR A1 - Gangl, M. A1 - Ziefle, A. T1 - Motherhood, labor force behavior, and women’s careers: An empirical assessment of the wage penalty for motherhood in Britain, Germany and the United States Y1 - 2009 DO - 10.1353/dem.0.0056 JF - Demography VL - 46 IS - 2 ER -