@inbook{Wu2001,
author = {Wu, L.L. and Bumpass, L.L. and Musick, K. },
title= {Historical and life course trajectories of nonmarital childbearing},
year = {2001},
editor = {Wu, L.L.},
editor = {Wolf , B.},
booktitle = {Out of Wedlock. Causes and Consequences of Nonmarital Fertility},
address = {New York},
publisher = {Russell Sage Foundation},
pages = {3--48},
}