@book { TheImpactoftheInternetontheMarketingofTravelIntermediaries,
    title = "The Impact of the Internet on the Marketing of Travel Intermediaries",
    author = "Michael {Ott}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832451622",
    url = "https://m.diplom.de/document/220689"
}