@article{Curtin2000,
author = {Curtin, R. and Presser, S. and Singer, E. },
title= {The effects of response rate changes on the index of consumer sentiment},
year = {2000},
doi = {10.1086/318638},
journal = {Public Opinion Quarterly },
volume = {64},
number = {2},
pages = {413−428},
}