@article{Groves2012,
author = {Groves, R.M. and Pressor, S. and Tourangeau, R. and West, B.T. and Couper, M.P. and Singer, E. and Toppe, C.},
title= {Support for the survey sponsor and nonresponse bias},
year = {2012},
doi = {10.1093/poq/nfs034},
journal = {Public Opinion Quarterly},
volume = {76},
number = {3},
pages = {512−524},
}