TY  - GEN
AU  - Snijders , Tom A.B.
AU  - Bosker , Roel J.
TI  - Multilevel analysis: an introduction to basic and advanced multilevel modeling
SN  - 0761958908
U1  - 515 
PY  - 1999///
CY  - London
PB  - Sage Publications
KW  - ANALYSIS
ER  -