| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Envoys of the gospel in Ethiopia: In the steps of the evangelical pioneers, 1898-1936 | 978-91-526-2655-9 (91-526-2655-5) | 1999 |
| Evangelical pioneers in Ethiopia: Origins of the Evangelical church Mekane Yesus | 978-91-7080-364-2 (91-7080-364-1) | 1978 |