TY  - JOUR
A1  - Singer, E.
A1  - Couper, M.P.
T1  - Do incentives exert undue influence on survey participation? Experimental evidence
Y1  - 2008
DO  - 10.1525/jer.2008.3.3.49
JF  - Journal of Empirical Research on Human Research Ethics
VL  - 3
IS  - 3

ER  -