@book { MultimedialesPersonalmarketing,
    title = "Multimediales Personalmarketing",
    author = "Simon {Wengert}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832436438",
    url = "https://m.diplom.de/document/219293"
}