References

- Crystal Cruises, London

- Aviation and Tourism, Alzenau

- Aurland Ressursutvikling AS, Aurland, Norway 

- Hanse Lounge, Hamburg

- MSC Cruises, Munich

- GLG Research

- Skaidi Hotel, Norway

- Cunard Line , Hamburg

- Passat Kreuzfahrten, Hamburg/Offenbach

- Plantours Kreuzfahrten, Bremen

- Island Pro Tours, Hamburg

- Iceland Pro Cruises, Reykjavik

- Zeiträume Reisen - Individual, Pohlheim

- Hapag Lloyd Kreuzfahrten, Hamburg

- TUI Cruises, Hamburg

- Third Bridge Group, London