@book { ZielgruppenspezifischesKirchenmarketing,
    title = "Zielgruppenspezifisches Kirchenmarketing",
    author = "Matthias {Roesberg}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832464714",
    url = "https://m.diplom.de/document/221891"
}