TY  - BOOK
AU  - Krippendorff,Klaus
TI  - Content analysis : an introduction to its methodology 
SN  - 9781412983150
PY  - 2013///
CY  - Los Angeles 
PB  - Sage
KW  - Computer aided content analysis
KW  - Social media - Internet - Data analysis
KW  - Social science research
ER  -