@book { DasuniversaleSystemderPersonalpronomina,
    title = "Das universale System der Personalpronomina",
    subtitle = "Das Fundament für Habermas' normative Begründung der menschlichen Vernunft?",
    author = "Sabine {Engel}",
    year = "1998",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086940"
}