@article{Schonlau2007,
author = {Schonlau, M. and Soest, A. and Kapteyn, A.},
title= {Are ‘Webographic’ or attitudinal questions useful for adjusting estimates from web surveys using propensity scoring?},
year = {2007},
doi = {10.2139/ssrn.1006108},
volume = {1},
number = {3},
pages = {155‒163},
}