@inbook{van de Walle1968,
author = {van de Walle, E.},
title= {Marriage in African censuses and inquiries},
year = {1968},
editor = {Brass, W.},
editor = {Coale, A.J.},
editor = {Demeny, P.},
editor = {Heisel, D.F.},
editor = {Lorimer, F.},
editor = {Romaniul, A.},
editor = {Walle, E.V.D.},
booktitle = {The Demography of tropical Africa},
address = {Princeton, New Jersey},
publisher = {Princeton University Press},
pages = {183--238},
}