@article{Ruggles2009,
author = {Ruggles, S.},
title= {Reconsidering the Northwest European family system: Living arrangements of the aged in comparative historical perspective},
year = {2009},
doi = {10.1111/j.1728-4457.2009.00275.x},
journal = {Population and Development Review},
volume = {35},
number = {2},
pages = {249--273},
}