@inbook{Knab2007,
author = {Knab, J.T. and McLanahan, S. },
title= {Measuring cohabitation: Does how, when, and who you ask matter?},
year = {2007},
editor = {Hofferth, S.L.},
editor = {Casper, L.M. },
booktitle = {Handbook of Measurement Issues in Family Research},
address = {Mahwah, NJ},
publisher = {Lawrence Erlbaum Associates},
pages = {19--33},
}