@book { ManagementHandbuchSportMarketing,
    title = "Management-Handbuch Sport-Marketing",
    author = "Arnold {Hermanns} and Florian {Riedmüller}",
    year = "2011",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220836"
}