@book { MglichkeitenundGrenzendesPersonalentwicklungsControlling,
    title = "Möglichkeiten und Grenzen des Personalentwicklungs-Controlling",
    author = "Gunnar {Seckels}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832413859",
    url = "https://m.diplom.de/document/217247"
}