@article{Williams2015,
author = {Williams, K. and Sassler, S. and Addo, F. and Frech, A. },
title= {First-birth timing, marital history, and women’s health at midlife},
year = {2015},
doi = {10.1177/0022146515609903},
journal = {Journal of Health and Social Behavior },
volume = {56},
number = {4},
pages = {514--533},
}