@book{Brass1968,
author = {Brass, W. and Coale, A.J. and Demeny, P. and Heissel, D.F. and Lorimer, F. and Romaniuk, A. and Van de Walle, E.},
title= {The demography of tropical Africa},
year = {1968},
address = {Princeton, NJ},
publisher = {Princeton University Press},
}