@inbook{Caldwell1981,
author = {Caldwell, J.C.  and Caldwell, P. },
title= {Function of child-spacing in traditional societies and the direction of change},
year = {1981},
editor = {Page, H.J.},
editor = {Lestaeghe, R.J.},
booktitle = {Child spacing in tropical Africa: Traditions and change},
address = {London},
publisher = {Academic Press},
pages = {73--92},
}