@book { DidaktikdesDeutschenalsFremdsprache,
    title = "Didaktik des Deutschen als Fremdsprache",
    author = "Toshitada {Mandokoro}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1071932"
}