@book { AnalysedesauslndischenIncomingTourismusderStadtHamburg,
    title = "Analyse des ausländischen Incoming-Tourismus der Stadt Hamburg",
    author = "Katrin {Raithel}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832412036",
    url = "https://m.diplom.de/document/217123"
}