TY  - CHAP
A1  - Scherpenzeel, A.C.
A1  - Bethlehem, J.G.
T1  - How representative are online panels? Problems of coverage and selection and possible solutions
Y1  - 2011
DO  - 10.4324/9780203844922-5
A3  - Das, P.
A3  - Ester, P.
A3  - Kaczmirek, L.
T2  - Social and behavioral research and the internet. Advances in applied methods and research strategies
CY  - New York
PB  - Routledge

ER  -