@book { SocialBusinessasaSustainableBusinessConcept,
    title = "Social Business as a Sustainable Business Concept",
    author = "Markus   {Beck}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640829958",
    url = "https://www.hausarbeiten.de/document/153897"
}