| title | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|
| Burg Fleckenstein | 978-3-7954-1478-8 | 2003 | Thomas Biller · Bernhard Metz · René Kill | |
| Distance Learning - Issue: Volume 14 #2 | 978-1-64113-096-7 | 2017 | Michael Simonson · John G. Flores | |
| Quarterly Review of Distance Education: Volume 18 #2 | 978-1-64113-091-2 | 2017 | Michael Simonson | |
| Quarterly Review of Distance Education, Volume 18, Number 1: 'Research that Guides Practice'' | 978-1-68123-938-5 | 2017 | " |
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