TY  - JOUR
A1  - Mercer, A.W.
A1  - Kreuter, F.
A1  - Keeter, S.
A1  - Stuart, E.A.
T1  - Theory and practice in nonprobability surveys
Y1  - 2017
DO  - 10.1093/poq/nfw060
VL  - 81
IS  - S1

ER  -