@book { SchulgeschichteinDeutschland,
    title = "Schulgeschichte in Deutschland",
    author = "Gert {Geißler}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b20938",
    url = "https://www.peterlang.com/document/1347993"
}