@article{Boas:2019,
title={Recruiting large online samples in the United States and India: Facebook, Mechanical Turk, and Qualtrics},
DOI={10.1017/psrm.2018.28},
journal={Political Science Research and Methods},
publisher={Cambridge University Press},
author={Boas, Taylor C. and Christenson, Dino P. and Glick, David M.},
pages={1-19},
year={2019}
}