The Research system /
Gorde:
| Beste egile batzuk: | , |
|---|---|
| Formatua: | Liburua |
| Hizkuntza: | English |
| Argitaratua: |
Paris :
O.E.C.D.,
1972, 1973.
|
| Gaiak: |
Aurkibidea:
- Vol.1, France, Germany, United Kingdom. Vol.2, Belgium, Netherlands, Norway, Sweden, Switzerland.