@article{Brien1999,
author = {Brien, M.J. and Lillard, L.A. and Waite, L.J.},
title= {Interrelated family-building behaviours: cohabitation, marriage and non-marital conception},
year = {1999},
doi = {10.2307/2648089},
journal = {Demography},
volume = {36},
pages = {535--551},
}