@book { SchulportrtforschungundSchulentwicklung,
    title = "Schulporträtforschung und Schulentwicklung",
    author = "Markus {Brenk} and Anton {Salomon}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136098"
}