@inbook{Alt1991,
author = {Alt, C.},
title= {Stichprobe und Representativität der Survey-Daten},
year = {1991},
editor = {Bertram, H.},
booktitle = {Die Familie in Westdeutschland},
address = {Opladen},
publisher = {Leske und Budrich},
pages = {497--531},
}