TY  - BOOK
AU  - CALLGARO,Mario
AU  - MANFREDA,Katja L.
AU  - VEHOVAR,Vasja
TI  - Web survey methodology 
SN  - 9780857028617
PY  - 2015///
CY  - Los Angeles
PB  - Sage
KW  - Surveys
KW  - Methodology
KW  - Internet surveys
KW  - Social surveys
N1  - Includes bibliographical references
ER  -