@book { DiedeutschenFarben,
    title = "Die deutschen Farben",
    author = "Florian {Butter}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656546894",
    url = "https://www.hausarbeiten.de/document/264751"
}