@book { ObstundGemsesindgesundoder,
    title = "Obst und Gemüse sind gesund - oder?",
    author = "Sven-David {Müller}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656239420",
    url = "https://www.hausarbeiten.de/document/197941"
}