| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Extension Science: Information Systems in Agricultural Development. | 978-0-521-34437-1 (0-521-34437-9) | 1988 |
| Extension Science: Information Systems in Agricultural Development | 978-0-521-34887-4 (0-521-34887-0) | 1988 |