@article{Coombs1970,
author = {Coombs, L.C. and Freedman, R. and Friedman, J. and Pratt, W.F.},
title= {Premarital pregnancy and status before and after marriage},
year = {1970},
doi = {10.1086/224823},
volume = {75},
number = {5},
pages = {800--820},
}