@book { PraktischeHandreichungfrFremdsprachenlehrer,
    title = "Praktische Handreichung für Fremdsprachenlehrer",
    author = "Udo O.H. {Jung}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106348"
}