| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| A Biosystematic Study of the African and Madagascan Rubiaceae-Anthospermeae | 978-3-211-81919-7 (3-211-81919-3) | 1986 | ||
| Biosystematic Study of the African and Madagascan Rubiaceae-Anthospermeae | 978-0-387-81919-8 (0-387-81919-3) | 1986 | ||
| Plants of the Simen: a Flora of the Simen Mountains and Surroundings, Northern Ethiopia | 978-90-72619-65-5 (90-72619-65-X) | 2005 | Sileshi Nemomissa | |