@book { DasMediumFilmimGeschichtsunterricht,
    title = "Das Medium Film im Geschichtsunterricht",
    author = "Gunnar {Norda}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/309076"
}