@book { Multiplikationsmarketing,
    title = "Multiplikationsmarketing",
    subtitle = "Das neue Marketingtool für erfolgreiche Unternehmen",
    author = "Martina {Bachmayer}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836601603",
    url = "https://m.diplom.de/document/225204"
}