| 其他書名 | An Address Before the Fifth International Conference of Cooperative Institute of the Green Meadow Foundation, Zürich, Switzerland, July 31, 1956 |
| 出版 | Cooperative Institute of the Green Meadow Foundation, 1956 |
| URL | http://books.google.com.hk/books?id=UsgZHQAACAAJ&hl=&source=gbs_api |