@book { DasltesteZwickauerStadtbuch13751481undseineSprache,
    title = "Das älteste Zwickauer Stadtbuch (1375-1481) und seine Sprache",
    author = "Helmut {Protze}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105509"
}