@book { DieFinanzierungvonpolitischenParteieninEuropa,
    title = "Die Finanzierung von politischen Parteien in Europa",
    author = "Gerrit {Manssen}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1105060"
}