TY  - BOOK
AU  - Ader Herman J. Ed.
AU  -  Mellenbergh Gideon J. Ed.
TI  - Research methodology in the life, behavioural and social sciences
SN  - 0761958843
U1  - SN1:f, N9 
PY  - 1999///
CY  - London
PB  - Sage Publication       
KW  -  PSYCHOLOGY
KW  - RESEARCH METHODS
ER  -