@book { HinterGitternGefangenenzeitschrifteninDeutschland,
    title = "Hinter Gittern - Gefangenenzeitschriften in Deutschland",
    author = "Janka {Kreißl}",
    year = "2004",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832475871",
    url = "https://m.diplom.de/document/222864"
}