@book {9783402175682, title = "Der grosse Sänger David - euer Muster", author = "Kohlschein, Franz AND Küppers, Kurt", isbn = "9783402175682", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783402175682", url = "https://content-select.com/de/portal/media/view/604216ff-ae30-4183-b197-5a28b0dd2d03", publisher = "Aschendorff Verlag", language = "ger", }