@book { DieDistributionvonNaturkostinderBRDeutschland,
    title = "Die Distribution von Naturkost in der BR Deutschland",
    author = "Gisela {Ruhrmann-Adolph}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832401764",
    url = "https://m.diplom.de/document/216126"
}