@article{Bumpass1977,
author = {Bumpass, L.L.  and Mburugu, E.K. },
title= {Age at marriage and completed family size},
year = {1977},
doi = {10.1080/19485565.1977.9988259},
journal = {Social Biology },
volume = {24},
number = {1},
pages = {31--37},
}