@book{WiesnerSponholz, author = {Wiesner, Kurt and Sponholz, Uwe}, title = {Dienstleistungsmarketing}, address = {M{\"u}nchen/Wien/Oldenbourg}, isbn = {3-486-58209-7 , 978-3-486-58209-3}, language = {de} } @book{Wiesner, author = {Wiesner, Kurt}, title = {Wellnessmanagement}, publisher = {Schmidt}, address = {Berlin}, isbn = {978-3-503-10360-7 , 3-503-10360-0}, language = {de} }