@book{Wachter1978,
author = {Wachter, K.W. and Hammel, E.A. and Laslett, P. },
title= {Statistical studies of historical social structure},
year = {1978},
doi = {10.1016/B978-0-12-729150-5.50001-8},
address = {London and New York},
publisher = {Academic Press},
}