@book { PersonalfhrungausindividualpsychologischerSicht,
    title = "Personalführung aus individualpsychologischer Sicht",
    author = "Mechthild Maria {Horstrup}",
    year = "2014",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/279104"
}