@book { SCHLAFEN,
    title = "SCHLAFEN",
    subtitle = "Pflegerische Interventionen zur Schlafförderung",
    author = "Nikolaus {Abuja}",
    year = "2014",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/274488"
}