@book { SkinfoodNahrungfrdieHaut,
    title = "Skinfood - Nahrung für die Haut",
    author = "Sabine {Hahn}",
    year = "2016",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/333969"
}