@book { InternalBranding,
    title = "Internal Branding",
    author = "Franz-Rudolf {Esch} and Christian {Knörle} and Kristina {Strödter}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1219063"
}