TY  - BOOK
AU  - Ader,Herman J.
AU  - Mellenbergh,Gideon J.
TI  - Research methodology: in the life, behavioural and social sciences 
SN  - 0761958843
PY  - 1999///
CY  - London
PB  - Sage Publication
KW  - Social sciences
KW  - Methodology
KW  - Research
KW  - Life sciences
KW  - Methods
N1  - Refences : p. 352-380
ER  -