TY  - BOOK
AU  -  Krippendorff, Klaus  .
TI  - Content analysis: an introduction to its methodology / 
SN  - 978-1-4129-8315-0
U1  - X3:f 
PY  - 2013///
CY  - California : 
PB  - Sage Publications, Inc , 
KW  - Content analysis (Communication)
ER  -