==Riferimenti esterni== * [http://www.fountainpennetwork.com/forum/index.php?/topic/128513-soennecken-information/] Discussione su FPN * [https://web.archive.org/web/20160323225440/http://www.rickconner.net/penspotters/soennecken.222.html] Pagina su Penspotters * [https://web.archive.org/web/20110721020749/http://www.poppelsdorf.de/zwischen_melb_und_weiher-Soennecken.htm] Storia dell'azienda relativa a Poppelsdorf * [http://en.wikipedia.org/wiki/Soennecken] Pagina su wikipedia in inglese * [http://de.wikipedia.org/wiki/Soennecken] Pagina su wikipedia in tedesco ==Note== <references/>