@book { SocialImpactsimTourismus,
    title = "Social Impacts im Tourismus",
    author = "Christoph {Schittenhelm}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832457631",
    url = "https://m.diplom.de/document/221224"
}