@book {9783402161920, title = "Die altchristliche Fastenpraxis Ebook PDF", author = "Schümmer, Johannes", isbn = "9783402161920", year = "1933", url = "http://www.content-select.com/index.php?id=bib_view&ean=9783402161920", url = "https://content-select.com/de/portal/media/view/604216fb-5cc4-46bf-b938-5a28b0dd2d03", publisher = "Aschendorff Verlag", language = "ger", }