| 其他書名 | A Study of the Agents Of, and Constraints On, Agricultural Development in Gombe Emirate, North Eastern State, Nigeria |
| 出版 | Overseas Development Administration, Foreign and Commonwealth Office, 1972 |
| URL | http://books.google.com.hk/books?id=aEy3yApK4GEC&hl=&source=gbs_api |