@book { SchriftlicheErzeugnissepsychischkrankerMenschen,
    title = "Schriftliche Erzeugnisse psychisch kranker Menschen",
    author = "Claudia {Winkler}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832414993",
    url = "https://m.diplom.de/document/217346"
}