@inbook{Bardet1990,
author = {Bardet, J-P. },
title= {Innovators and imitators in the practice of contraception in town and country},
year = {1990},
editor = {Van de Woude, A.},
editor = {De Vries, J.},
editor = {Hayami, A. },
booktitle = {Urbanization in history : a process of dynamic interactions},
address = {Oxford },
publisher = {Clarendon Press},
pages = {264--281},
}