@book { ProjektunterrichtGrundlagenNotwendigkeitundFormen,
    title = "Projektunterricht: Grundlagen, Notwendigkeit und Formen",
    author = "Matthias {Altmannsberger}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297824"
}