@article{Zack2019,
author = {Zack, E.S. and Kennedy, J. and Long, J.S.},
title= {Can nonprobability samples be used for social science research? A cautionary tale},
year = {2019},
doi = {10.18148/SRM/2019.V13I2.7262},
volume = {13},
number = {2},
pages = {215--227},
}