@book { FluktuationUrsachenundManahmen,
    title = "Fluktuation. Ursachen und Maßnahmen",
    author = "Ann-Christin {Schubert}",
    year = "2018",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/424275"
}