@book { DaskollegialgefhrteUnternehmen,
    title = "Das kollegial geführte Unternehmen",
    author = "Bernd {Oestereich} and Claudia {Schröder}",
    year = "2017",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1190388"
}