Internationale Statistiken und Studien
- Europäisches Tourismus Institut
- STR Global Hotelbenchmark
- Mercer Human Resource Consulting
- IPK International (World Travel Monitor)
- European Cities Marketing
- European Travel Commission HSMAI (Hospitality Sales & Marketing Ass'n)
- UIA (Union of International Associations)
- Chapter Germany ICCA (International Congress & Convention Association)
- WTO (World Tourism Organization)
