@book { VomeigenenSprechen,
    title = "Vom eigenen Sprechen",
    subtitle = "Eine Geschichte der spanisch-katalanischen Diglossie in Katalonien (1759-1859)",
    author = "Rolf {Kailuweit}",
    year = "1998",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1085495"
}