@book { UntersuchunginnovativerProjektideeninderErwachsenenbildung,
    title = "Untersuchung innovativer Projektideen in der Erwachsenenbildung",
    author = "Andreas {Gruner}",
    year = "2011",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/296430"
}