TY  - BOOK
AU  - Singer,Judith D.
AU  - Willett,John B.
TI  - Applied longitudinal data analysis: modeling change and event occurrence 
SN  - 0195152964
AV  - H62  .S56 2003
PY  - 2003///
CY  - New York
PB  - Oxford University Press
KW  - Longitudinal method
KW  - Social sciences
KW  - Research
ER  -