@techreport{Campanelli1997,
author = {Campanelli, P. and Sturgis, P. and Purdon, S. },
title= {Can You Hear Me Knocking: An Investigation into the Impact of Interviewers on Survey Response Rates},
year = {1997},
publisher = {National Centre for Social Research },
address = {London},
number = {NCSR paper},
}