TY  - BOOK
AU  - Krippendroff,Klaus   .
TI  - Content analysis: an introduction to its methodology / 
SN  - 9781412983150
U1  - 401.41 
PY  - 2013///
CY  - London : 
PB  - Sage , 
KW  - Content analysis
KW  - Communication
ER  -