TY  - GEN
AU  - Devellis, Robert F.
TI  - Scale development: theory and applications - 3rd ed
SN  - 9781412980449(pb)
U1  - 300.72 DEV/Sca 
PY  - 2012///
CY  - New Delhi
PB  - Sage Publications India Pvt. Ltd
N1  - Includes references and index
ER  -