@book { DasGeheimnisdesWahlerfolges,
    title = "Das Geheimnis des Wahlerfolges",
    author = "Heike {Kaltenthaler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090456"
}