@book { QualittsmanagementinTourismusDestinationen,
    title = "Qualitätsmanagement in Tourismus-Destinationen",
    author = "Anke {Müller}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832499501",
    url = "https://m.diplom.de/document/225066"
}