@book { DeutschunterrichtnachderPISAStudie, title = "Deutschunterricht nach der PISA-Studie", author = "Michael {Kämper-van den Boogaart}", year = "2014", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-05332-6", url = "https://www.peterlang.com/document/1053575" }