@book { DergeeigneteGmbHGeschftsfhrer,
    title = "Der geeignete GmbH-Geschäftsführer",
    author = "Bettina {Schmitz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101475"
}