| Titel | ISBN-13 (ISBN-10) | Erschei- nungsjahr | andere Autoren |
|---|---|---|---|
| Distance Education as Two-way Communication: Essays in Honour of Börje Holmberg: Essays in Honour of Borje Holmberg | 978-3-631-45359-9 (3-631-45359-O) | 1992 | Gerhard Ortner · Harald Wilmersdoerfer |