| Titel | Description | URL | Category |
|---|---|---|---|
| Collectify | A great software to organize your collection. | Collectify | Collecting |
| Gutschow Haus | Information about the "Gutschow" house - Friedrichstrasse 17 in which Horsters store was located. | Gutschow Haus | Conradi |
| Wikipedia | Wikipedia entry for Conradi Horster | Wikipedia Article | Conradi |
| Magic Circle of Germany | Homepage of the "Magic Circle Germany" | Magic Circle | Misc |