@article{Beatty1998,
author = {Beatty, P. and Herrmann, D. and Puskar, C. and Kerwin, J.},
title= {Don’t know’ responses in surveys: Is what i know what you want to know and do i want you to know it?},
year = {1998},
doi = {10.1080/741942605},
volume = {6},
number = {4},
pages = {407--426},
}