@techreport{Copen2013,
author = {Copen, C. and Daniels, K. and Mosher, W. },
title= {First premarital cohabitation in the United States: 2006–2010 National Survey of Family Growth},
year = {2013},
publisher = {National Center for Health Statistics},
address = {Hyattsville},
number = {National Health Statistics Report 64},
}