@book{Stoop2010,
author = {Stoop, I.A.L. and Billiet, J. and Koch, A. and Fitzgerald, R.},
title= {Improving survey response: Lessons learned from the European Social Survey},
year = {2010},
doi = {10.1002/9780470688335},
address = {Chichester},
publisher = {Wiley},
}