International congress on the occasion of the thirtieth anniversary of the Associated Schools Project Sofia, Bulgaria, 12-16 September 1983
| 団体著者: | |
|---|---|
| フォーマット: | 図書 |
| 言語: | English |
| 出版事項: |
Paris
United Nations Educational, Scientific, and Cultural Organization
1984.
|
| 主題: |