@book { VieleromanischeSprachensprechen,
    title = "Viele romanische Sprachen sprechen",
    author = "Christian {Koch}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16892",
    url = "https://www.peterlang.com/document/1058862"
}