@book { DieFreisinnigeParteidesKantonsZrichindenJahren19171924,
    title = "Die Freisinnige Partei des Kantons Zürich in den Jahren 1917-1924",
    author = "Heinz {Herren}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069747"
}