Longitudinal research
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Newbury Park, Calif.
Sage
c1991.
|
| Cyfres: | Sage university papers series. Quantitative applications in the social sciences
no.07-076 |
| Pynciau: |