TY - JOUR A1 - Rodgers, J.L. A1 - Kohler, H.-P. A1 - McGue, M. A1 - Behrman, J.R. A1 - Petersen, I. A1 - Bingley, P. A1 - Christensen, K. T1 - Education and cognitive ability as direct, mediated, or spurious influences on female age at first birth: Behavioral genetic models fit to Danish twin data Y1 - 2008 DO - 10.1086/592205 JF - American Journal of Sociology VL - 114 IS - S1 SP - S202 EP - -S232 ER -