| 其他書名 | The Present Status of Cooperative Schools and Classes in the United States with Suggestions as to Methods by which Such Work May be Organized. April, 1928 |
| 出版 | U.S. Government Printing Office, 1928 |
| URL | http://books.google.com.hk/books?id=IOg7KQ5pyhIC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |