@book { PersonalundOrganisationsentwicklung,
    title = "Personal- und Organisationsentwicklung ",
    author = "Maike {Unger}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640435593",
    url = "https://www.hausarbeiten.de/document/136303"
}