TY  - BOOK
AU  - DeVellis, Robert F
TI  - Scale development: theory and applications. (3rd ed.)
T2  - Applied social research methods series
SN  - 9781412980449 
AV  - H 61.27 Vel 
PY  - 2012///
CY  - Los Angeles
PB  - SAGE Publications
KW  - SCALING (SOCIAL SCIENCES)
N1  - Includes bibliographical references (p. 193-198) and index
ER  -