@book{Brass1968,
author = {Brass, W. and Coale, A.J. and Demeny, P. and Heisel, D.F. and Lorimer, F. and Romaniuk, A. and Walle, E.V.D.},
title= {Demography of tropical Africa},
year = {1968},
doi = {10.1515/9781400877140},
publisher = {Princeton University Press},
}