References
- Administration of Appenzell Innerrhoden Canton (Department of Economy and Labour), Switzerland
- Administration of Shahdag Mountain Resort, Azerbaijan
- Andreus Spa and Golf Hotel, St. Leonhard, Italy
- Arosa Kulm Hotel in Arosa, Switzerland
- Association 'Donautal-Aktiv', Germany
- Austrian Association of Private Accommodation Facilities, Austria
- Bavarian Hotel and Restaurant Association 'DEHOGA Bayern', Germany
- Bavarian Ministry of Economic Affairs, Regional Development and Energy, German
- Bavarian Public Real Estate Company 'Immobilien Freistaat Bayern', Germany
- Biosphere Reserve Swabian Alb, Germany