@book { QualittvonSchule,
    title = "Qualität von Schule",
    author = "Jürgen {van Buer} and Cornelia {Wagner} and Cornelia {Wagner} and Jürgen {van Buer}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04898-8",
    url = "https://www.peterlang.com/document/1053610"
}