@inbook{Knodel1983,
author = {Knodel, J.},
title= {Natural fertility: Age patterns, levels and trends},
year = {1983},
editor = {Bulatao, R.},
editor = {Lee, R.D.},
booktitle = {Determinants of Fertility in Developing Countries: A Summary of Knowledge},
address = {New York},
publisher = {National Academy Press},
pages = {61--102},
series = {Volume 1},
}