@book { InhaltskontrollevonFranchiseVertrgen,
    title = "Inhaltskontrolle von Franchise-Verträgen",
    author = "Kai-Thorsten {Zwecker}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090577"
}