@book { ManagementstrategischerErfolgsfaktoren,
    title = "Management strategischer Erfolgsfaktoren",
    author = "Jörg U. {Puma}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832404185",
    url = "https://m.diplom.de/document/216392"
}