@book {9783497613458, title = "Mein Freund Balu", isbn = "9783497613458", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783497613458", url = "https://content-select.com/de/portal/media/view/5e9ed4ef-b700-4e7f-8df5-3f99b0dd2d03", publisher = "Ernst Reinhardt Verlag", }