TY - JOUR A1 - Barber, J.S. T1 - The Intergenerational Transmission of Age at First Birth among Married and Unmarried Men and Women Y1 - 2001 DO - 10.1006/ssre.2000.0697 JF - Social Science Research VL - 30 IS - 2 SP - 219 EP - -247 ER -