TY  - RPRT
A1  - Kennedy, C.
A1  - Mercer, A.
A1  - Keeter, S.
A1  - Hatley, N.
A1  - McGeeney, K.
A1  - Gimenez, A.
T1  - Evaluating online nonprobability surveys
Y1  - 2016
UR  - https://www.pewresearch.org/methods/2016/05/02/evaluating-online-nonprobability-surveys/

ER  -