@book { BusinessToBusinessMarktpltzeinderHotellerie,
    title = "Business To Business Marktplätze in der Hotellerie",
    author = "Alexander {Rakete}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832447601",
    url = "https://m.diplom.de/document/220353"
}