TY  - GEN
AU  - Rubin, Allen 
AU  - Babbie, Earl 
TI  - Essential research methods for social work 
SN  - 9789355739667 (pb)
U1  - 361.3072 RUB-BAB 
PY  - 2016///
CY  - Austalia
PB  - Cengage
KW  - Internal validity
N1  - Include glossary bibliography index
ER  -