References
| Reference | Homepage |
| sino AG | http://www.sino.de |
| HSBC | http://www.hsbc.de/ |
| comdirect | https://www.comdirect.de/ |
| S Broker | https://www.sbroker.de/ |
| Renell Bank | http://www.renellbank.com/ |
| Finovesta | http://www.finovesta.de/ |
| ICF Bank | http://www.icfbank.de/ |
| M.M. Warburg | http://www.mmwarburg.de/ |
| Lang & Schwarz | http://www.ls-d.de/ |
| Hellwig Bank | http://www.hellwigbank.com/ |