@book { CorporateSocialResponsibilityinKMUs,
    title = "Corporate Social Responsibility in KMUs",
    author = "Daniel {Friedrich}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640490226",
    url = "https://www.hausarbeiten.de/document/140056"
}