@book { NachhaltigesCorporateDesigninDeutschland2021,
    title = "Nachhaltiges Corporate Design in Deutschland 2021",
    author = "Maria {Hegeholz}",
    year = "2022",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/1168694"
}