@book {9783784136264, title = "MAVO-Kommentar", isbn = "9783784136264", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783784136264", url = "https://content-select.com/de/portal/media/view/63f4f757-59bc-464d-8a73-46f9ac1b000f", publisher = "Lambertus Verlag", }