@inbook{Cleland1987,
author = {Cleland, J. and Johnson-Acsadi, G. and Marckwardt, A.},
title= {The Core Questions},
year = {1987},
editor = {Cleland, J.},
editor = {Scott, C.},
booktitle = {The World Fertility Surveys: an assessment},
address = {Oxford},
publisher = {Oxford University Press},
}