@inbook{Iwasawa2005,
author = {Iwasawa, M.},
title= {Cohabitation in Japan},
year = {2005},
editor = {Mainichi Shimbun Population Problems Research Council},
booktitle = {Family attitudes in an era of very low fertility: Report on the 1st National Survey on population, family, and generations in Japan [in Japanese},
address = {Tokyo},
publisher = {National Institute of Population and Social Security Research},
pages = {69--104},
}