@book { SprachenkampfSprachkontaktundSprachstatus,
    title = "Sprachenkampf, Sprachkontakt und Sprachstatus",
    author = "Piotr {Kocyba}",
    year = "2016",
    publisher = "Biblion",
    address = ", Germany",
    doi = "10.3726/b11789",
    url = "https://www.peterlang.com/document/1109815"
}