@inbook{Bras2018,
author = {Bras, H. and Suanet, B.},
title= {Family systems and spousal age differences in nineteenth and early twentieth century Netherlands},
year = {2018},
editor = {Puschmann, P.},
editor = {Riswick, T.},
booktitle = {Building bridges: Scholars, history and historical demography. A Festschrift in Honor of Professor Theo Engelen},
address = {Nijmegen},
publisher = {Valkhof Pers},
pages = {421‒446},
}