Research in education
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Cyhoeddwyd: |
Englewood, Cliffs
N.J. Prentice-Hall
[c1970].
|
| Rhifyn: | 2nd ed. |
| Cyfres: | Prentice-Hall series in educational measurement, research, and statistics
|
| Pynciau: |