@book { bungsbuchzurKostenundErlsrechnung,
    title = "Übungsbuch zur Kosten- und Erlösrechnung",
    author = "Hans-Ulrich {Küpper} and Gunther {Friedl} and Christian {Hofmann} and Burkhard {Pedell}",
    year = "2023",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1374032"
}