@book { WiederherstellungdeskatholischenExerzitiums,
    title = "Wiederherstellung des katholischen Exerzitiums",
    author = "Markus {Schubert}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638038737",
    url = "https://www.hausarbeiten.de/document/90008"
}