@book { DerbarrierefreieNaturerlebnispfad,
    title = "Der barrierefreie Naturerlebnispfad",
    author = "Alexandra {Feilen}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/226043"
}