@book { GuillaumedeMachautLamessedenostreDame,
    title = "Guillaume de Machaut: La messe de nostre Dame",
    author = "Carolin L. {Schmidt}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/298113"
}