@book { MarxismusNichtnurfrEinsteiger,
    title = "Marxismus – Nicht nur für Einsteiger",
    author = "Lothar {Geisler}",
    year = "2024",
    publisher = "Neue Impulse Verlag",
    address = "Essen, Deutschland",
    url = "https://neueimpulseverlag.openpublishing.com/document/1463833"
}