@book { OnlineKompetenzvonSenioren,
    title = "Online-Kompetenz von Senioren",
    subtitle = "Aktueller Stand, Notwendigkeiten, Handlungsempfehlungen",
    author = "Karina {Mahn}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832499174",
    url = "https://m.diplom.de/document/225034"
}