@inbook{Hajnal1983,
author = {Hajnal, J.},
title= {Two kinds of pre-industrial household formation system},
year = {1983},
editor = {Wall, R.},
editor = {Robin, J.},
editor = {Laslett, P.},
booktitle = {Family forms in historic Europe},
address = {Cambridge},
publisher = {CUP},
}