@techreport{Ventura2000,
author = {Ventura, S.J. and Bachrach, C.A.},
title= {Nonmarital Childbearing in the United States, 1940-99},
year = {2000},
publisher = {National Center for Heath Statistics},
address = {Hyattsville, Maryland},
number = {National Vital Statistics Reports 48(16)},
}