| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Changing Agricultural Opportunities: The Role of Farming Systems Approaches: Proceedings of the 14th International Symposium on Sustainable Farming Systems, Colombo, Sri Lanka, 11-16 November 1996 | 978-955-8219-OO-3 (955-8219-OO-2) | 1998 | N F C Ranaweera · H P M Gunasena |