@book { GesundernhrenKrebsvorbeugen,
    title = "Gesund ernähren - Krebs vorbeugen",
    author = "Gisa {Bührer-Lucke}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403386"
}