| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Agricultural Environments: Characterization, Classification and Mapping | 978-0-85198-582-4 (0-85198-582-3) | 1987 |
| The Future of Shifting Cultivation in Africa and the Task of Universities/F2779 | 978-92-5-102092-0 (92-5-102092-2) | 1985 |