| 其他書名 | The Difference Engines of Johann Müller, Charles Babbage and Georg and Edvard Scheutz |
| 出版 | Linköping University, Department of Technology and Social Change, 1987 |
| ISBN | 91787014659789178701469 |
| URL | http://books.google.com.hk/books?id=2MsmAAAAMAAJ&hl=&source=gbs_api |