| February 8, 2019 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| March 31, 2017 | Edited by MARC Bot | add VIAF and wikidata ID |
| April 29, 2008 | Created by an anonymous user | initial import |
| February 8, 2019 | Edited by Gustav-Landauer-Bibliothek Witten | merge authors |
| March 31, 2017 | Edited by MARC Bot | add VIAF and wikidata ID |
| April 29, 2008 | Created by an anonymous user | initial import |