@book { EmployerBranding,
    title = "Employer Branding",
    author = "Claudia {Sack}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656037620",
    url = "https://www.hausarbeiten.de/document/180691"
}