@book { ZumKonsumvonBioProdukten,
    title = "Zum Konsum von Bio-Produkten",
    author = "Sten {Cudrig}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638590433",
    url = "https://www.hausarbeiten.de/document/66452"
}