@book { StiftungenundSparkassen,
    title = "Stiftungen und Sparkassen",
    author = "Christiane {Krumme} and Karlheinz {Muscheler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18821",
    url = "https://www.peterlang.com/document/1069058"
}