@book {9783497613847, title = "Erik schafft es!", isbn = "9783497613847", edition = "1", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783497613847", url = "https://content-select.com/de/portal/media/view/5f6af9de-a91c-46a6-9cec-64ceb0dd2d03", publisher = "Ernst Reinhardt Verlag", }