| Titel | ISBN-13 (ISBN-10) | Erscheinungsjahr |
|---|---|---|
| Education and Development: Implementation of Educational Satellite Television Program in Ethiopia, the case of Addis Ababa | 978-3-8433-8039-3 (3-8433-8039-2) | 2010 |
| SPSS in Social Science Research: Statistical Tests in Research with SPSS Applications | 978-3-8443-0187-8 (3-8443-0187-9) | 2011 |