@book { KleineEnzyklopdieDeutscheSprache,
    title = "Kleine Enzyklopädie – Deutsche Sprache",
    author = "Wolfgang {Fleischer} and Gerhard {Helbig} and Gotthard {Lerchner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093050"
}