@book { ZurEntwicklungderNameneinerStadt,
    title = "Zur Entwicklung der Namen einer Stadt",
    subtitle = "Dargestellt am Beispiel der Stadt Güstrow in Mecklenburg-Vorpommern",
    author = "Karl-Ernst {Sommerfeldt}",
    year = "2004",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097778"
}