Staff (29 February 2008), Newsletter Nr. 18(PDF) (in German), Hamburg Tourismus GmbH, archived from the original(PDF) on 10 September 2008, retrieved 13 August 2008
Staff (29 February 2008), Newsletter Nr. 18(PDF) (in German), Hamburg Tourismus GmbH, archived from the original(PDF) on 10 September 2008, retrieved 13 August 2008