@book { DiedeutscheSpracheinderGegenwart,
    title = "Die deutsche Sprache in der Gegenwart",
    author = "Stefan J. {Schierholz}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091521"
}