TY  - GEN
AU  - Ader, Herman J. 
AU  - Mellenbergh, Gideon J. 
TI  - Research methodology: in the life behavioural and social sciences
SN  - 0761958843
U1  - 300.72 
PY  - 1999///
CY  - London
PB  - SAGE
KW  - SOCIAL SCIENCE
ER  -