@book { AnwendungmodernerIUKTechnologienimTourismus,
    title = "Anwendung moderner IUK-Technologien im Tourismus",
    author = "Malgorzata {Madej}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836624022",
    url = "https://m.diplom.de/document/226419"
}