@book { SPIEGELundFOCUSMittelderLeserlenkung,
    title = "SPIEGEL und FOCUS: Mittel der Leserlenkung",
    author = "Kerstin {Volkmer}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/217408"
}