@book { EsistschwarzVorlesebuchfrKinder,
    title = "Es ist schwarz - Vorlesebuch für Kinder",
    author = "A. {Appeldorn} and Anna {Conradi} and Adelina {Zwaan}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1011930"
}