@book { Schulforschungkonkret,
    title = "Schulforschung konkret",
    author = "Gabriele {Förster}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00333-8",
    url = "https://www.peterlang.com/document/1054194"
}