@book { DerJahresabschluss,
    title = "Der Jahresabschluss",
    author = "Michael {Bitz} and Dieter {Schneeloch} and Guido {Patek} and Wilfried {Wittstock}",
    year = "2014",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220923"
}