International yearbook of education. 10th- 1948-.
| Formatua: | Liburua |
|---|---|
| Hizkuntza: | English |
| Argitaratua: |
Geneva
s.n.
n.d.
|
| Saila: | United Nations Educational, Scientific and Cultural Organization. International Bureau of Education. Publication no. 109, etc.
|
| Gaiak: |