@book { SprechakttheorieEinberblick,
    title = "Sprechakttheorie: Ein Überblick",
    author = "Stephanie {Hilbert}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297846"
}