Die Kur - Kraft für Körper, Seele und den Alltag
Charles Atanga Adongo, Francis E. Amuquandoh, Edem Kwesi Amenumey
Journal of Hospitality and Tourism Management, Volume 31, June 2017, Pages 105-113
https://www.sciencedirect.com/science/article/abs/pii/S1447677015301248