@inbook{Ryder1980,
author = {Ryder, N.B.},
title= {Components of temporal variations in American fertility},
year = {1980},
editor = {Hiorns, R.W.},
booktitle = {Demographic patterns in developed  societies. Symposia of the Society for the Study of Human Biology},
address = {London},
publisher = {Taylor and Francis Ltd.},
pages = {15--54},
}