@book { Privatrecht,
    title = "Privatrecht",
    subtitle = "Bürgerliches Recht, Handelsrecht, Gesellschaftsrecht, Kapitalmarktrecht, Insolvenzrecht",
    author = "Wolfgang {Kallwass} and Peter {Abels} and Olaf {Müller-Michaels}",
    year = "2024",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1437705"
}