@inbook{Ellwood2004,
author = {Ellwood, D. and Jencks, C.},
title= {The spread of single-parent families in the United States since 1960},
year = {2004},
editor = {Moynihan, D.P.},
editor = {Rainwater, L.},
editor = {Smeeding, T.},
booktitle = {The Future of the Family},
address = {New York},
publisher = {Russell Sage},
}