@book { DiePUMAAGvondergrauenMauszumLifestyleUnternehmen,
    title = "Die PUMA AG: von der grauen Maus zum Lifestyle Unternehmen",
    author = "Christian {Volz}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297744"
}