TY  - BOOK
AU  - DeVellis,Robert F.
TI  - Scale development: theory and applications 
SN  - 9781506341569
U1  - 300.72 DEV 
PY  - 2017///
CY  - London
PB  -  Sage, 
KW  - Social science
KW  - Measurement
KW  - Research
ER  -