| March 23, 2020 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| February 6, 2020 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| December 9, 2017 | Edited by Gustav-Landauer-Bibliothek Witten | date of birth, bio, links |
| December 9, 2017 | Edited by Gustav-Landauer-Bibliothek Witten | Added new photo |
| October 14, 2016 | Created by Mek | Added new book. |