@book { KommunaleSelbstverwaltungindenUSA,
    title = "Kommunale Selbstverwaltung in den USA",
    author = "Björn {Hoppenstedt}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102795"
}