@article{Heerwegh2009,
author = {Heerwegh, D.},
title= {Mode differences between face-to-face and web-surveys: An experimental investigation of data quality and social desirability effects},
year = {2009},
doi = {10.1093/ijpor/edn054},
volume = {21},
number = {1},
pages = {111‒121},
}