@book { WiederherstellungdeskatholischenExerzitiums,
    title = "Wiederherstellung des 'katholischen Exerzitiums'",
    author = "Markus {Schubert}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225827"
}