@book { VirtuelleUnternehmen,
    title = "Virtuelle Unternehmen",
    author = "Michael {Heinze} and Christian {Trapp} and Michaela {Wölk} and Sandra {Krause-Steger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101940"
}